Why is my car making a rattling noise?
A rattling noise in a car can come from many sources. The most common and usually harmless cause is a loose heat shield on the exhaust — a thin metal panel that can corrode and come loose. Rattles from the suspension area when going over bumps suggest worn bushes or drop links. A rattle from the engine bay on startup usually points to a timing chain issue on higher-mileage engines.
Likely causes
Loose or corroded exhaust heat shield
Very common, especially on older cars — metallic rattle from under the car, often more prominent when cold
Worn anti-roll bar drop links
Rattle or knock over speed bumps and rough road — very common cheap repair
Worn anti-roll bar bushes
Similar symptom to drop links — knock or rattle over bumps
Timing chain rattle
Rattle on cold start that reduces when warm — can worsen to serious chain stretch issue
Loose heat shield or panel
Bodywork rattles are usually harmless but annoying
Repairs you may need
Typical cost range: £30–£900 — Drop links: £60–150. Anti-roll bar bushes: £80–180. Timing chain: £600–1,800. Exhaust heat shield: £50–150.
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