Symptoms
- Distinct clunk or knock over potholes and speed bumps
- Noise seems to come from one corner of the car
- No noise on smooth roads
Likely causes
- CommonWorn sway bar end linkThese small links wear out and develop play, clunking as the suspension moves.
- CommonWorn strut mount or bushingThe mount at the top of the strut can wear and allow movement, causing a knock.
- PossibleLoose or worn control arm bushingBushings cushion the control arm; once worn, they let it shift and clunk.
- PossibleLoose heat shield or exhaust hanger (not suspension)Sometimes a rattling heat shield is mistaken for a suspension clunk.
What to do
- Note which corner of the car the clunk seems to come from.
- Have a helper bounce that corner of the car by hand while you listen and watch for movement in links or bushings.
- Inspect visible sway bar end links and bushings for cracking or play.
- Have a mechanic put the car on a lift and physically pry on suspension components to find play.
- Replace the specific worn part identified rather than guessing and replacing everything.
- Recheck for the noise after the repair by driving over the same bumps.
Tools and parts
Sway bar end linkSearch: “sway bar end link for [your car model]”
Control arm bushingSearch: “control arm bushing for [your car model]”
When to call a pro
A shop with the car on a lift can pry on each suspension component to pinpoint exactly which part is worn, which is hard to do accurately at home.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.