Symptoms
- Small amber or red light on the fender doesn't light up
- Other exterior lights work normally
- Noticed during a routine walk-around light check
- May be paired with the corner of a headlight or taillight assembly
Likely causes
- CommonBurned out side marker bulbThese small bulbs are simple and wear out like other exterior lighting.
- PossibleCorroded socket or connectorTheir location near the fender can expose them to moisture and road spray.
- PossibleBlown fuse shared with another light circuitSide markers sometimes share a fuse with parking lights or another exterior light.
What to do
- Locate the side marker light, usually a small amber or red lens on the front or rear fender.
- Check your vehicle's specific access method, since some pop out from outside and others need access from behind the fender liner.
- Remove the small bulb and inspect it for a broken filament or dark, discolored glass.
- Install a new bulb of the correct type, usually a small wedge-base bulb.
- Check the fuse box if a new bulb doesn't resolve it, since side markers can share fuses with other lights.
- Clean the socket of any corrosion if the connection looks compromised.
- Test the light after reassembly to confirm it's working.
- Have a shop handle it if access requires removing the front bumper or fender liner on your specific model.
Tools and parts
- Small screwdriver or trim tool
Side marker light bulbSearch: “side marker light bulb for [your car make model year]”
When to call a pro
If access requires removing bumper components on your specific vehicle, a shop can do this quickly without risking damage to clips or paint.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.