900 guides
Cars & vehicles
Warning lights, noises, brakes, batteries, leaks and more.
Starting problems 50
- Car clicks but won't start
- Car cranks but won't start
- Car is completely dead - no lights, no sounds, nothing
- Car won't start in cold weather
- Car won't start in hot weather
- Car starts then dies immediately
- Car won't start right after getting gas
- Car won't start intermittently
- Key won't turn in the ignition
- Push-button start doesn't work
- Car won't start after sitting for weeks
- Car won't start even after a jump start
- Battery warning light on and car won't start
- Grinding noise from the starter when starting the car
- Dashboard lights flicker and car won't start
- Security light flashing and car won't start
- Car won't start after rain or a car wash
- Car won't start and smells like gasSafety
- Diesel engine won't start in cold weather
- Car won't start after installing a new battery
- Car won't start - no fuel pump priming sound
- Car cranks slowly but won't start
- Car won't start and makes a whining noise
- Manual transmission car won't start unless clutch is pressed
- Automatic car won't start unless in Park
- Car won't start - no crank, no click, but has power
- Car won't start after an oil change
- Car alarm won't disarm and car won't start
- Key fob battery is dead and car won't start
- Immobilizer light flashing and car won't start
- Car needs several tries before it starts
- Car only starts with jumper cables, never on its own
- Car won't start after an accident or collisionSafety
- Brake pedal won't depress and car won't startSafety
- Hybrid won't start - no 'Ready' light
- Car won't start due to a blown fuse
- Car won't start due to corroded battery terminals
- Car won't start after replacing the alternator
- Car won't start due to a suspected timing issue
- Car won't start due to fouled spark plugs
- Engine is flooded with fuel and won't start
- Car won't start after flood or water submersion damageSafety
- Car won't start - key not recognized
- Car won't start and the theft/security light stays on solid
- Starter relay clicking rapidly and car won't start
- Car won't start - can't hear the fuel pump at all
- Car won't start and check engine light is flashing
- Car won't start after catalytic converter theft
- Car won't start due to a loose battery terminal
- Car cranks but backfires and won't start
Noises 50
- Squealing noise when starting the car
- Squealing noise only when the AC is on
- Belt squeal when turning the steering wheel
- High-pitched whine that increases with engine RPM
- Grinding noise when starting the engine
- Clicking noise from under the hood at idle
- Ticking noise that gets louder as RPM increases
- Knocking noise from the engine under acceleration
- Loud knocking noise on cold start that goes away when warm
- Rattling noise from underneath the car
- Rattling noise from the exhaust pipe
- Loud roaring exhaust noise
- Popping or backfiring noise from the exhaust
- Hissing noise from under the hood
- Humming or droning noise that increases with speed
- Whining noise from the engine bay at idle
- Chirping noise from the engine
- Metal-on-metal grinding noise from the engine
- Clunking noise when accelerating from a stop
- Clicking noise when turning the steering wheel
- Whining noise when turning the steering wheel
- Squealing noise the moment the AC compressor engages
- Rattling noise inside the cabin
- Rattling noise from the dashboard
- Buzzing noise from the air vents
- Heat shield rattling noise
- Whistling noise at highway speed
- Hissing noise after turning off the engine
- Roaring noise that increases with speed
- Humming noise from the tires
- Clicking noise from a wheel while driving straight
- Grinding noise when shifting gears in a manual transmission
- Loud bang or backfire when starting the engine
- Rattling noise when idling in Drive but not in Park or Neutral
- Knocking noise from the engine under load going uphill
- Metallic rattle that goes away when you give it more throttle
- Chirping noise that only happens when the engine is cold
- Squeaking noise from the fan belt area
- Ticking noise from the exhaust manifold
- Rumbling noise from the exhaust that gets louder over time
- Whining noise specifically from the alternator
- Grinding noise from the AC compressor
- Rattling sound coming specifically from inside the dashboard vents
- Grinding noise with the clutch pedal pressed in (manual transmission)
- Loud noise that only happens on rough or bumpy roads
- Whining noise when accelerating, especially uphill
- Squealing tires when turning at low speed
- Unusual noise that only happens when the car is cold
- Droning noise that only happens at a certain speed
- Clunking noise when going over bumps
Warning lights 50
- Check engine light on steady (not flashing)
- Check engine light flashing
- Check engine light after filling up gas
- Check engine light with reduced power or limp mode
- Oil pressure warning light (oil can symbol)Safety
- Oil change reminder / maintenance light
- Battery warning light (charging system)
- Battery light flickers on and off while driving
- TPMS light on (tire pressure warning, steady)
- TPMS light blinking then staying on
- TPMS light stays on after getting new tires
- ABS warning light on
- ABS light and brake warning light on together
- Airbag / SRS warning light on
- Traction control light on (steady)
- Traction control light blinking while driving
- Traction control OFF light stuck on
- Temperature warning light / engine overheatingSafety
- Low coolant warning light
- Red brake warning light on
- Parking brake light won't turn off
- Brake fluid low warning light
- Brake pad wear warning light
- Service engine soon light on
- Maintenance required light
- Wrench warning light on
- Washer fluid low light
- Low fuel warning light
- Check fuel cap warning light
- Door ajar light stays on with doors closed
- Seatbelt warning chime won't stop
- EPC light on (electronic power control)
- Transmission warning light on
- Glow plug warning light (diesel)
- DPF warning light (diesel particulate filter)
- DEF / AdBlue warning light
- Hill descent control warning light
- Lane departure warning system light on
- Forward collision warning system light on
- Power steering warning light on
- Suspension warning light on
- AWD / 4WD warning light on
- EV battery warning light
- Hybrid system warning light
- EV charging system fault light
- Tire pressure light on in cold weather
- Key fob low battery warning
- Multiple warning lights on at once
- Security / immobilizer light on, car won't start
- Adaptive cruise control warning light
Brakes 50
- Brakes squealing when stopping
- Brakes squeal only when cold, then stop
- Brakes grinding, metal-on-metal sound
- Soft or spongy brake pedal
- Brake pedal goes to the floorSafety
- Brake pedal hard to press
- Car pulls to one side when braking
- Steering wheel shakes when braking
- Brake pedal pulsates when stopping
- Squeaking noise while driving, not when braking
- Clicking noise when braking
- Grinding noise when turning and braking
- Parking brake won't release
- Parking brake won't engage or hold
- Brake warning light on but pedal feels normal
- Burning smell after braking
- Brakes smokingSafety
- Brake fluid leak
- Low brake fluid level
- Brake fluid looks dark or dirty
- Spongy brakes after bleeding or a pad change
- Brakes locking up when stopping
- ABS pulsing under normal, gentle braking
- ABS activates on dry pavement
- Brake noise only when braking in reverse
- New brake pads still squeaking
- Brake pads wearing unevenly
- Brake rotor warped, causing vibration
- Brake caliper sticking
- Brake caliper seized
- Dragging brakes, car won't coast normally
- Excessive brake dust on wheels
- Brake pedal sinks slowly while stopped
- Brakes feel weak, poor stopping power
- Brake vibration only at highway speed
- Rear brakes wearing faster than front
- Front brakes wearing faster than rear
- Brake booster failure symptoms
- Hissing noise when pressing the brake pedal
- Parking brake light flickers while driving
- Electric parking brake won't release
- Brake pads worn down to metal
- Squeaking brakes in rain or humid weather
- Brake noise goes away when pressing pedal harder
- Trailer brakes not working
- Brake fluid fade on a long mountain descent
- Mechanic says brakes are fine but they're still noisy
- Brake noise comes and goes intermittently
- Brake pedal feels different after pad replacement
- Brakes squeak on the first drive of the day
Tires & wheels 50
- Car has a sudden flat tire
- Tire keeps losing air slowly
- Found a nail or screw in the tire
- Tire pressure warning light is on
- TPMS light stays on after getting new tires
- Tire wearing more on the inside edge
- Tire wearing more on the outside edge
- Tire wearing more in the center of the tread
- Tire has cupped or scalloped wear
- Bulge or bubble on the tire sidewallSafety
- Car vibrates at highway speed
- Steering wheel shakes when braking
- Wheel shimmy that comes and goes at certain speeds
- Scrubbing or squealing noise when turning at low speed
- Lug nuts won't loosen when changing a tire
- Lug nut is stripped or rounded off
- Lug nut feels cross-threaded
- Car pulls to one side while driving
- TPMS sensor won't reset after adjusting pressure
- Questions about using the spare tire (donut)
- How to tell if tires are too old to keep using
- Tire tread is getting low
- Tread wear bars are showing
- Tire sidewall is cracking or dry rotted
- Tires make a humming or roaring noise while driving
- Rhythmic thumping noise from a tire
- Wheel rim is bent
- Wheel rim appears crackedSafety
- Tires lose pressure in cold weather
- Tire pressure is too high
- Tires don't match each other
- Tire sizes don't match front to rear on an AWD vehicle
- Run-flat tire problems
- When and why to rotate tires
- New tires cause vibration after installation
- Wheel center cap is missing or rattling
- Wheel is leaking air where the tire meets the rim
- Valve stem is leaking air
- Questions about switching to winter or snow tires
- Tire chains don't fit or feel loose
- Wheel has curb rash or scrape marks
- Should a punctured tire be plugged or patched
- Tire blows out while drivingSafety
- Lost the wheel lock key (locking lug nut key)
- Aftermarket wheels rub against the car
- TPMS sensor battery is dead
- Tires spin but car won't move in snow or mud
- Tire sidewall has a scrape or scuff
- Tire rubs against the fender or wheel well
- Tire developed a flat spot from sitting parked
Steering & suspension 50
- Clunking noise over bumps
- Steering wheel feels stiff to turn
- Whining or groaning noise when turning
- Power steering fluid leak
- Worn shocks or struts
- Car bounces excessively after bumps
- Humming or growling noise from a wheel
- Clunk when turning the steering wheel
- Clicking noise when turning (CV joint)
- Steering wheel vibrates when turning
- Too much play in the steering wheel
- Car wanders or drifts on the highway
- Knocking noise from the front end
- Squeaking suspension over bumps
- Car dips or nose-dives when braking
- Car sits lower on one corner
- Power steering whines when turning sharply
- Electric power steering warning light
- Steering is hard to turn when parked
- Steering is stiff in cold weather
- Signs of a bad ball joint
- Signs of a bad tie rod end
- Clunking from worn control arm bushings
- Clunk over small bumps (sway bar link)
- Creaking or knocking from strut mount
- Leak from steering rack
- Shimmy only over bumps, not otherwise
- Violent shaking at speed (death wobble)Safety
- Loud power steering pump noise
- Steering wheel off-center after alignment or repair
- Loud bang over speed bumps
- Oily residue leaking from strut
- Broken or cracked coil spring
- Leaf spring noise (trucks/SUVs)
- Air suspension warning light
- Air suspension won't inflate
- Power steering fluid low or empty
- Sudden loss of power steering assist
- Wheel hop or shudder under hard acceleration
- Suspension system warning light
- Uneven or wrong ride height (sensor fault)
- Creak from front end when turning at low speed
- Car scrapes on speed bumps and driveways
- Wobble in a lifted truck at speed
- Rear end sags with passengers or cargo
- Power steering fluid looks foamy or milky
- Suspension problem causing uneven tire wear
- Suspension noise only at low speed over rough roads
- Still noisy after replacing struts/shocks
- Clunking noise but can't find the source
Transmission & clutch 50
- Car won't go into gear
- Transmission slipping
- Car shifts hard between gears
- Delayed engagement when shifting into drive
- Delayed engagement when shifting into reverse
- CVT makes a whining noise
- CVT shudders at low speed
- Clutch pedal feels spongy
- Clutch slipping (manual transmission)
- Clutch pedal sticking to the floor
- Grinding when shifting gears (manual)
- Grinding noise in reverse
- Transmission fluid leak
- Burning smell from the transmission
- Transmission fluid is dark or milky
- Transmission overheating
- Transmission jerks or lurches when shifting
- Transmission stuck in one gear (limp mode)
- Transmission warning light on
- Whining noise in neutral
- Whining noise while driving that changes with speed
- Clunk when shifting from park to drive
- Car rolls when in park
- Parking pawl not holding (won't stay in park)
- Transmission won't downshift
- Transmission shifts too early or too late
- Manual transmission pops out of gear
- Hard to shift into first gear
- Hard to shift into reverse
- Clutch pedal makes noise when pressed
- Burning clutch smell
- Clutch chatter when starting from a stop
- Transmission fluid spots under the car
- Transmission dipstick shows no fluid
- Automatic transmission won't shift out of park
- Brake shift interlock not working
- Shifter stuck in park
- Torque converter shudder
- Transmission makes noise only when cold
- Transmission makes noise only when hot
- Clutch pedal feels loose or has too much play
- Clutch hydraulic leak
- Burnt transmission fluid smell after towing
- Vibration when accelerating (drivetrain-related)
- Delayed shifting when the car is cold
- Transmission hunting between gears
- Transmission slips only under load or going uphill
- Grinding shifting into second gear (manual)
- How often to change transmission fluid
- Transmission dipstick tube leaking or missing dipstick
Cooling & overheating 50
- Car is overheatingSafety
- Coolant leak
- Low coolant warning light
- Radiator leak
- Radiator cooling fan not turning on
- Thermostat stuck closed
- Thermostat stuck open
- Water pump leaking
- Water pump noise
- Heater core leak
- Sweet smell inside the car
- Coolant boiling overSafety
- Coolant reservoir overflowing
- White smoke from exhaust (coolant-related)Safety
- Milky or frothy oil (coolant mixing with oil)Safety
- Head gasket leak signsSafety
- Temperature gauge fluctuating up and down
- Temperature gauge reading high
- Coolant puddle under the front of the car
- Coolant leak only when parked
- Radiator cap not sealing properly
- Coolant level drops with no visible leak
- Air pocket in the cooling system
- Car overheats in traffic but not on the highway
- Car overheats on the highway but not in traffic
- Car overheats only with the AC on
- Radiator hose leaking
- Radiator hose collapsed when cool
- Coolant mixed with the wrong type
- Rusty or dirty-looking coolant
- Coolant smells burnt
- Overheating after a coolant flush
- Cooling fan runs constantly, even when the engine is cold
- Cooling fan noisy
- Coolant temperature sensor fault
- Steam coming from under the hoodSafety
- Engine runs hot at idle but fine while driving
- Engine runs hot while driving but fine at idle
- Water pump weep hole leak
- Heater hose leak
- Coolant expansion tank cracked
- Coolant cap not holding pressure
- Overheating after a thermostat replacement
- Overheating with a new radiator
- Low coolant with no leak found
- Coolant leaking into the cabin floor
- Coolant disappearing with no puddle anywhere
- Car overheats then cools down randomly
- Water pump belt brokenSafety
- Serpentine belt squeal near the water pump
Battery & electrical 50
- Car battery is dead and won't start anything
- Car battery dies overnight or after sitting a day or two
- Alternator warning light or battery not charging while driving
- Car makes a clicking sound but won't start
- Power windows won't go up or down
- Power door locks won't lock or unlock
- Corrosion on car battery terminals
- Same car fuse keeps blowing repeatedly
- Car interior or exterior lights are dim or flickering
- Battery warning light on the dashboard
- New car battery won't hold a charge
- Jump-starting the car isn't working
- Car radio or infotainment screen won't turn on
- Car horn doesn't make any sound
- Dashboard lights flicker or go out completely
- Car 12V outlet or USB port isn't charging devices
- Key fob doesn't lock, unlock, or start the car
- Burning electrical smell inside or under the carSafety
- Car battery case looks swollen or bulgingSafety
- Check engine light comes on with electrical symptoms
- Remote start doesn't work
- Backup or parking sensors aren't working
- Battery terminal is loose or wiggles
- Multiple electrical problems happening at once
- Cigarette lighter or accessory outlet stopped working entirely
- Windshield wipers won't turn on or move
- Interior dome or map light doesn't turn on
- Aftermarket stereo or accessory draining the battery
- Heated seats don't get warm
- Power side mirror won't adjust or fold
- Cruise control won't engage or turn on
- Sunroof or moonroof won't open or close
- New battery terminal or clamp doesn't fit properly
- Power seat won't move or adjust
- Multiple exterior lights out at once (not just one bulb)
- Static or noise in the radio that changes with engine speed
- Rear window defroster doesn't heat up
- Hazard lights won't turn on or flash
- Radio asking for a code after battery was disconnected
- Turn signal blinks faster than normal
- ABS warning light stays on
- Electric power steering warning light or heavy steering
- Power trunk or liftgate won't open electronically
- Blower motor won't blow air on any fan speed
- Battery charger or trickle charger won't charge the battery
- Electrical problems that happen only after rain or car wash
- Traction control and ABS lights on together
- Corroded connector causing intermittent electrical problems
- Battery terminal feels hot to the touch
- Electrical problems that only happen in cold weather
Lights 50
- One headlight is out
- Both headlights are out at the same time
- Headlights look dim or yellowed over time
- Moisture or fog inside the headlight housing
- Headlight aim seems crooked or pointed too low/high
- Taillight is out on one side
- Brake light isn't working
- Turn signal doesn't light up on one side
- Fog lights won't turn on
- Interior lights won't turn off, draining the battery
- License plate light is out
- Reverse (backup) light doesn't come on
- Headlight fogs up right after a car wash or rain
- Headlight flickers on and off
- LED headlight or taillight isn't working
- Cracked headlight lens letting water in
- Daytime running lights aren't turning on
- Interior lights flicker while driving
- Side marker light isn't working
- Water found in the headlight bulb connector
- Headlight switch feels stuck or doesn't respond
- High beams don't work but low beams are fine
- Parking lights stay on and won't turn off
- Headlight bulb keeps burning out repeatedly
- Turn signal doesn't blink properly when DRL and signal share a bulb
- Headlight has permanent water buildup that won't clear
- Third (center high-mount) brake light isn't working
- HID or xenon headlight won't turn on
- New headlight bulb doesn't fit or match the connector
- Fog light has moisture or condensation inside
- Headlights seem too dim for safe night driving
- Turn signal makes clicking sound but no light flashes anywhere
- Headlight assembly feels loose or rattles
- Brake light stays on all the time, even without braking
- Headlight relay clicks but headlights don't turn on
- Taillight lens is cracked or broken
- Headlights stopped working after a battery replacement
- Sparking or arcing seen near a headlight bulbSafety
- How to tell if headlight condensation is normal or a real problem
- Taillight flickers while driving
- Headlight bulb area feels extremely hot or housing looks melted
- Turn signal works sometimes but not consistently
- Headlight wiring chewed or damaged, possibly by rodents
- Automatic headlight mode isn't turning lights on in low light
- Water pooling inside the taillight housing
- Headlights stopped working after jump-starting the car
- Turn signals don't work on either side
- Ice forms inside the headlight in cold weather
- Standard headlight bulb has a blue tint but isn't a true HID
- Headlight connector pins are melted or discolored
Heat & A/C 50
- Car AC blowing warm air
- Car AC blows cold then turns warm
- Weak airflow from car AC or heater vents
- Car blower only works on the highest fan speed
- Car blower motor not working at all
- Car heater blows cold air instead of hot
- Car heater takes a long time to warm up
- Musty or moldy smell from car AC vents
- Car windows fog up on the inside
- Car windows fog up on the outside
- Blend door clicking noise from car dashboard
- AC compressor clutch not engaging
- Car AC makes a loud noise when turned on
- Car AC smells like gas or chemicalsSafety
- Signs of a clogged cabin air filter
- Dual-zone AC: one side blows warm, other cold
- Car heater smells like burning
- AC leaking water inside the car
- Water dripping under car when AC is on (is it normal?)
- AC compressor turning on and off rapidly
- Car AC freezing up with ice on the lines
- AC recirculation button not working
- Car AC/climate control buttons not responding
- Automatic climate control won't reach the set temperature
- Signs your car AC is low on refrigerant
- Car AC still warm after adding refrigerant
- Signs of a failing heater core
- Rear window defroster not working
- Front windshield defroster is weak
- AC blowing from the wrong vents (floor instead of face, etc.)
- Car climate control display is blank
- Cabin fan makes squealing or rattling noise
- AC smells musty only when first started
- Car heater fan won't shut off with the car off
- Car AC isn't cold enough in very hot weather
- AC condenser damaged by road debris
- Blend door actuator clicking repeatedly (not just occasionally)
- Temperature knob or slider doesn't change temperature
- AC belt squeals when AC is turned on
- AC compressor seized or won't turn
- Dual-zone AC: passenger side controls do nothing
- AC vents blowing out dust
- Heater blows hot at idle but cold while driving
- AC pressure switch fault preventing compressor engagement
- No AC at all - suspect a blown fuse
- Climate control keeps resetting to default settings
- AC blows warm intermittently during highway driving
- Heater makes a rattling noise when turned on
- Oily residue around AC compressor or lines
- Heater stuck blowing cold, blend door stuck in cold position
Leaks & smells 50
- How to identify a car fluid leak by puddle color
- Oil leak - brown or black puddle under the car
- Oil leak from the valve cover gasket
- Oil leak from the oil pan gasket
- Oil leak from the rear main seal
- Oil dripping right after driving vs. after sitting parked
- Coolant leak - green, orange, or pink puddle
- Coolant leak from the radiator
- Coolant leak from a hose
- Coolant leak from the water pump
- Transmission fluid leak - red or brown puddle
- Power steering fluid leak
- Brake fluid leakSafety
- Washer fluid leak - clear puddle (usually harmless)
- Clear water leak from AC - is it normal?
- Gasoline smell inside the carSafety
- Gasoline smell outside the car or visible fuel leakSafety
- Burning oil smell from the car
- Burning rubber smell from the car
- Burning plastic smell from the carSafety
- Exhaust smell inside the cabinSafety
- White smoke from the exhaust
- Blue smoke from the exhaust
- Black smoke from the exhaust
- Smoke coming from under the hoodSafety
- Smoke coming from under the dashboardSafety
- Sweet smell from vents (possible coolant leak)
- Rotten egg smell from the exhaust or engine
- Burning smell after using the brakes
- Oil dripping onto the exhaust causing a burning smell
- Leak under the car only happens when the AC is on
- Leak appears only when the car is parked on an incline
- Leak underneath the car after an oil change
- Differential or gear oil leak
- Transfer case fluid leak (4WD/AWD vehicles)
- Fuel smell after refueling - normal or a problem?
- Leak or oil residue around the oil filler cap
- Leak near the hood latch or washer reservoir hose
- Puddle of water under the car specifically after AC use (benign)
- Sweet antifreeze smell with no visible puddle
- Oil on spark plugs or burning oil smell from the engine bay
- CV axle grease leak (torn boot)
- Oily leak from a shock absorber or strut
- Water leaking inside the car from a clogged sunroof drain
- Oily residue on the AC compressor (refrigerant oil)
- Steam vs. smoke from under the hood - how to tell the differenceSafety
- Leak only appears after long drives, not short trips
- Small drips vs. large puddles - how urgent is my leak?
- Leak with both a warning light and a burning smellSafety
- Mystery leak - can't identify the color or source
Exhaust, fuel & emissions 50
- Car is suddenly much louder than usual
- Metallic rattling noise from underneath the car
- Catalytic converter was stolen
- Catalytic converter clogged, car has no power
- Failed emissions test for high hydrocarbons or carbon monoxide
- Failed emissions test for high NOx
- Rotten egg smell from the exhaust
- Black smoke coming from the exhaust
- White smoke coming from the exhaust
- Blue smoke coming from the exhaust
- Fuel economy has dropped noticeably
- Engine idles rough or shakes at a stop
- Engine stalls or dies at idle
- Car stalls while driving
- Car hesitates or stumbles when accelerating
- Random/multiple cylinder misfire (P0300)
- Single cylinder misfire (P0301-P0308 style code)
- Check engine light on with rough running
- Smell gasoline inside the car
- Fuel leak or gas smell outside the carSafety
- Car won't accelerate or has very little power
- Idle surges up and down (hunting)
- Exhaust backfires with a bang
- Exhaust pops or crackles when letting off the gas
- Water dripping from the tailpipe
- Check engine light from a loose gas cap
- Fuel gauge reading wrong or stuck
- Engine floods and is hard to start
- Fuel pump makes a loud whining noise
- Loud clicking or ticking from fuel injectors
- Symptoms of a clogged fuel filter
- Bad gas or contaminated fuel symptoms
- Car stalls or won't restart in hot weather (vapor lock)
- Small EVAP leak code (like P0442 or P0455)
- Car won't start, no fuel pump sound (no prime)
- Muffler has rusted through with a hole
- Exhaust pipe hanging low or dragging
- Diesel engine runs rough with smoke
- Diesel exhaust fluid (DEF) warning light on
- Diesel puffs white smoke on cold start
- Turbocharger makes a whistling or whining noise
- Car loses power specifically under load (hills, towing, passing)
- Gas pump clicks off early or won't fill the tank
- Smell exhaust fumes inside the car while drivingSafety
- Car fails emissions test because monitors are 'not ready'
- Bad oxygen sensor causing poor fuel economy
- Idle surges or dips specifically when AC turns on
- Car hesitates or stumbles only when the engine is cold
- Puff of smoke only at startup, runs fine after
- Exhaust smell noticeable when parked but not drivingSafety
Body, doors & windows 50
- Car door won't open from outside
- Car door won't open from inside
- Car door won't close or latch properly
- Door ajar warning light stays on with doors closed
- Power window stuck down and won't go up
- Power window stuck up and won't roll down
- Power window moves slowly or jerkily
- Window is crooked or off its track
- Window falls back down or won't stay up
- Trunk won't open
- Trunk won't close or latch shut
- Hatchback or trunk won't stay open (weak struts)
- Truck or SUV tailgate won't open
- Key fob won't lock or unlock the doors
- Central locking not working on all doors
- Door lock clicks repeatedly but doesn't lock
- Child safety lock stuck on or off
- Wipers streak or smear instead of cleaning the windshield
- Wipers chatter, skip, or judder across the windshield
- Wipers don't move at all
- Wiper motor makes a grinding or straining noise
- Windshield washer fluid won't spray
- Windshield has a small chip
- Windshield crack is spreading
- Wiper blade is torn or falling apart
- Rust spots appearing on the car body
- Rust in wheel wells or on the undercarriage
- Water leaks inside the car when it rains
- Water pooling in the trunk after rain
- Sunroof is leaking water into the cabin
- Sunroof won't close
- Sunroof stuck open and won't move
- Wind noise from a door at highway speed
- Door handle broken, loose, or missing a piece
- Side mirror won't adjust or fold electronically
- Side mirror glass is cracked or broken
- Heated side mirror not working
- Bumper is loose or hanging
- Paint chips and scratches on the body
- Hood won't latch closed properlySafety
- Hood release stuck, hood won't pop open
- Rattling noise from inside a door panel
- Window tint bubbling or peeling
- Convertible top won't close
- Fuel door won't open
- Gas cap flap door stuck shut, can't get fuel
- Door sags or is hard to open/close (worn hinges)
- Weatherstripping peeling or falling off
- Key stuck in the door lock cylinder
- Mud flap hanging loose or dragging
Keys & in-car tech 50
- Key fob not working at all
- Key fob only works up close
- Push-button start says key not detected
- Dashboard shows key fob battery low warning
- Key stuck in ignition and won't come out
- Key won't turn in the ignition
- Remote start not working
- Keyless entry not unlocking doors
- Trunk or hatch release button not working
- Car alarm goes off randomly
- Car alarm won't turn off
- Steering wheel locked and key won't turn
- Need a spare key or key programmed
- Key fob interference from other devices
- Immobilizer light flashing and car won't start
- Infotainment screen frozen or unresponsive
- Infotainment system won't turn on
- Infotainment system slow or laggy
- Touchscreen unresponsive to touch
- Bluetooth won't pair with phone
- Bluetooth connects but no audio
- Bluetooth audio cutting out or choppy
- CarPlay not connecting with cable
- Wireless CarPlay not connecting
- Android Auto not connecting
- Android Auto keeps disconnecting
- Backup camera not displaying image
- Backup camera image blurry or distorted
- Backup camera guidelines missing or misaligned
- Parking sensors beeping constantly
- Parking sensors not detecting obstacles
- Parking sensor malfunction warning on dash
- Car radio has no sound
- Radio only static or poor reception
- USB port not charging phone
- USB port not recognized for music or media
- Navigation can't find GPS signal
- Navigation gives wrong directions or outdated maps
- Voice commands or voice assistant not working
- Infotainment system won't install software update
- Steering wheel audio or control buttons not working
- Aux input not working
- SD card or map card errors
- Car won't sync contacts from phone
- Wireless charging pad not charging phone
- Infotainment system rebooting repeatedly
- Key fob starts the car but won't lock or unlock doors
- Lost all car keys
- Radio presets or settings lost after battery disconnect
- Key fob case cracked or broken
EV & hybrid 50
- EV won't charge at all
- EV charging very slowly
- EV charging stops before reaching full or set limit
- Charging cable won't release from the car
- Charging port door won't open
- Charging port door won't close or latch
- Public charging station won't start a session
- Home Level 2 charger not working
- EV shows reduced range
- EV range drops significantly in cold weather
- EV battery percentage drops fast when parked
- 12V battery dead on an EV, won't power on
- EV won't power on
- Hybrid car won't start
- Hybrid battery warning light on
- EV high-voltage battery warning or fault light
- Regenerative braking feels weak
- Regenerative braking too strong or grabby
- Charging cable gets hot while charging
- Charging error code shown on display
- EV makes high-pitched whine while driving
- Hybrid gas engine won't shut off
- Hybrid won't switch to EV/electric mode
- Check engine light on a hybrid
- EV battery degradation or capacity loss over time
- Charging light blinking or showing error pattern
- EV won't accept DC fast charging
- Home charger keeps tripping the breaker
- EV takes much longer to charge in cold weather
- Battery percentage indicator inaccurate or jumps
- Hybrid battery not holding charge
- EV thermal management or cooling fan running loudly
- Charging scheduled but doesn't start at set time
- EV charging plug won't fit the outlet or charger
- EV range estimate wildly inaccurate
- Hybrid transitions roughly between electric and gas power
- Charging cable frayed or damaged
- EV or hybrid battery swelling, safety concernSafety
- EV won't shift out of Park
- Service EV system or reduced power warning
- Charging session interrupted repeatedly
- Hybrid makes clicking noise when switching modes
- EV app won't connect to car for remote features
- Cabin doesn't heat or cool well while charging or preconditioning
- EV battery preconditioning not working
- Hybrid 12V battery drains overnight
- Charging port pins bent or damaged
- One-pedal driving not working as expected
- Software update needed to fix a charging issue
- Charging cost or kWh tracking looks inaccurate
Maintenance 50
- How often should you change your car's oil
- Put the wrong type or weight of oil in your car
- Overfilled the engine oil
- Oil level low between scheduled oil changes
- Mixed synthetic and conventional motor oil
- Oil changed but the filter wasn't replaced
- How to check automatic transmission fluid
- Overdue for a transmission fluid service
- Mixed different colors or types of coolant
- Topped off coolant with the wrong water-to-coolant ratio
- Put the wrong fluid in the windshield washer reservoir
- Brake fluid looks old, dark, or hasn't been changed
- Power steering fluid is low
- Differential or gear oil service overdue
- Battery terminals covered in white or blue corrosion
- Battery terminal or cable feels loose
- Connected jumper cables in the wrong order
- Worried you made a mistake jump-starting a car
- Car keeps needing a jump start
- General car battery maintenance and lifespan tips
- Engine air filter is dirty and needs checking
- Musty smell from vents, cabin air filter overdue
- How often to check tire pressure
- Tire pressure drops in cold weather
- How often to rotate tires and why it matters
- Uneven tire wear from skipped rotations
- Spare tire has been neglected and may not be usable in an emergency
- How often to replace windshield wiper blades
- Windshield washer fluid freezing in cold weather
- Maintenance reminder light won't reset after service
- Spark plugs overdue for replacement
- Checking the serpentine belt for wear
- Timing belt replacement interval approaching or overdue
- Preparing a car for long-term storage
- Do you need fuel stabilizer and how to use it
- Preparing your car for winter
- Preparing your car for a summer road trip
- What to expect at a new car's first scheduled service
- Severe vs normal maintenance schedule, which applies to you
- Keeping maintenance records for a warranty or extended warranty
- Preventing rust on the undercarriage
- Headlight lenses turning yellow or cloudy
- How to check tire tread depth
- Signs you need a wheel alignment
- Topping off coolant safely without getting burned
- Fuel filter overdue for replacement
- PCV valve maintenance and when to check it
- How often to do a full radiator/coolant flush
- Radio, clock, or settings reset after disconnecting the battery
- Tire valve stem cracked or leaking
Motorcycles, RVs & boats 50
- Motorcycle clicks but won't start
- Motorcycle won't start and makes no sound at all
- Motorcycle battery keeps dying or won't hold a charge
- Motorcycle chain is loose or has too much slack
- Motorcycle chain skips or jumps under power
- How and how often to lubricate a motorcycle chain
- Motorcycle won't idle or stalls at idle
- Motorcycle runs fine cold but stalls once warmed up
- Motorcycle is hard to shift gears
- Motorcycle clutch is slipping
- Motorcycle brake lever or pedal feels spongy
- Motorcycle has a flat or slowly leaking tire
- Motorcycle fuel petcock or fuel valve problems
- Motorcycle carburetor is flooding with fuel
- Motorcycle won't start after sitting all winter
- Motorcycle headlight is out or very dim
- Motorcycle turn signals not working or blinking fast
- Motorcycle engine is overheating
- RV water pump won't turn on or run dry
- RV water heater not heating water
- RV toilet won't flush properly
- RV black or gray tank sensor shows wrong level
- RV fresh water tank won't fill
- RV water smells bad, like rotten eggs or plastic
- RV has no electrical power when plugged into shore power
- RV house battery not charging
- RV power converter not working
- RV generator won't start
- RV propane appliance not working (stove, fridge, furnace)
- RV slide-out won't extend or retract
- RV awning won't retract or extend properly
- RV air conditioner not cooling well
- RV furnace not working or not heating
- RV refrigerator not cooling on propane
- Trailer lights not working at all
- Trailer lights work on one side but not the other
- Trailer brakes not working or weak
- Trailer wheel bearing making noise
- Trailer tires wearing unevenly
- Trailer hitch problems: won't latch, rattles, or feels loose
- Trailer sways or fishtails while towing
- Outboard boat motor won't start
- Boat motor overheating
- Boat motor stalls at idle or low speed
- Boat battery is dead or won't hold a charge
- Boat won't get up on plane
- Boat vibrates or shakes, possibly propeller related
- Boat bilge pump not working
- Boat fuel line or tank problems from ethanol fuel
- Jet ski (PWC) won't start