Stretched timing chain: symptoms, causes and consequences
A timing chain lasts a long time, but it can stretch over the years. That often starts with a rattling noise straight after starting. In this article you can read how to recognise a stretched chain, why it stretches and what you can do before the engine is damaged.
By the team at Autobedrijf Willemsbrug, RDW-approved APK (MOT) test station since 1979 · Updated 6 November 2026
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The short answer
You mainly recognise a stretched timing chain by a rattling or clattering noise from the engine, straight after a cold start and at idle. Later the engine warning light can come on, with a fault code about crankshaft and camshaft timing (such as P0016 or P0017). The engine can then run roughly and lose power. A stretched chain can jump a tooth or break and cause severe engine damage. So have a garage listen to the engine and read it out as soon as possible.
What does a timing chain do?
The timing chain connects the crankshaft to the camshaft, so the engine’s valves open and close at the right moment. The crankshaft is the shaft at the bottom of the engine that the pistons turn. The camshaft is the shaft at the top of the engine that operates the intake and exhaust valves. The two have to turn in a fixed ratio. The timing drive takes care of that.
An engine has either a timing belt or a timing chain for this job. The chain is made of hardened steel and looks like a bicycle chain. It runs inside the engine and is lubricated by the engine oil. A chain tensioner keeps it tight and plastic guides keep it in place.
| Timing chain | Timing belt | |
|---|---|---|
| Material | Hardened steel | Reinforced rubber compound |
| Lubrication | By the engine oil | Usually no lubrication needed |
| Replacement | Usually no fixed interval, but it does wear | At the manufacturer’s interval, roughly between 60,000 and 240,000 km according to the ANWB |
| Access | Often harder to reach, more work | Usually on the outside of the engine block, easier to reach |
| When to replace | When worn, often first heard as a rattle after a cold start | On time, at the interval, to prevent it from breaking |
Source: ANWB (the Dutch motoring organisation), Wat is beter: distributieriem of -ketting? and Distributieriem vervangen (both in Dutch)
If your car has a belt, read our page on timing belt replacement.
Which symptoms point to a stretched timing chain?
The best-known symptom is a metallic rattle from the side of the engine where the timing drive sits, especially in the first seconds after a cold start. According to the ANWB, you can hear a bad chain with the car stationary and the engine running, especially straight after a cold start. If you rev the engine a little in neutral, the ticking or rattling gets faster. Other signs often come later.
| What you notice | What may be going on | Advice |
|---|---|---|
| Short rattle on a cold start | Early stretch, or a tensioner that is slow to build oil pressure | Have it checked soon |
| Rattle that stays and rises with the revs | Clear stretch or worn guides | Drive as little as possible and have it checked soon |
| Engine warning light with code P0016 or P0017 | Mismatch between camshaft and crankshaft | Have it read out and do not drive on for long |
| Engine runs badly or stalls | Chain may have jumped a tooth | Do not drive on, have the car transported |
Sources: ANWB and Gates, Comprehensive Guide to Timing Chain Replacement
Why does a timing chain stretch?
A chain stretches because the pins and bushes between the links wear. Each link gets a fraction more play. Across the whole chain that adds up, so the chain gets longer. The sprockets, the tensioner and the guides wear along with it. According to the ANWB, the quality of the engine oil is the main factor in how long the chain lasts.
To find out how often your engine needs fresh oil, read how often to change engine oil. How quickly a chain stretches varies a lot by engine. According to the ANWB, some engines suffered from chains that stretched or snapped prematurely. We wrote separate articles about two well-known examples: VW TSI timing chain problems and the BMW N47 diesel timing chain.
What happens if you keep driving with a stretched chain?
If you keep driving with a stretched chain, you risk the chain jumping a tooth or breaking and severely damaging the engine. As long as the chain is only stretched, the engine may run less well. The camshaft then lags slightly behind the crankshaft, so the valves open and close slightly late. Fuel consumption and emissions can rise and power can drop as a result. Meanwhile the wear speeds up, because a slack chain strikes the guides harder.
If the chain jumps one or more teeth, the timing between crankshaft and camshaft is no longer right. If the chain breaks, the engine stops immediately. On many engines the valves can then hit the pistons, causing severe engine damage. According to the ANWB, snapping chains on some engines led to high repair costs and wrecked engine blocks.
How does the mechanic check whether the chain has stretched?
The mechanic combines listening, reading out the engine computer and looking. The chain sits inside the engine and cannot be seen from the outside.
- Listening on a cold start: the car needs to have stood for a few hours first. The mechanic listens to where the noise comes from and how long it lasts.
- Reading out fault codes: with diagnostic equipment he reads fault codes from the memory of the engine computer. Codes that have not (yet) turned on the engine warning light are visible too.
- Checking the readings: on some modern engines the diagnostic equipment shows how far the camshaft position differs from the crankshaft. A large deviation fits a stretched chain.
- Assessing the oil and filter: metal particles or bits of plastic point to wear of the chain or the guides.
- Looking inside if needed: if in doubt, the mechanic looks at the tensioner and the guides through an opening or after removing a cover.
If the engine warning light is already on, also read what an engine warning light means. After the inspection we tell you what is going on. We tell you the price in advance and we only carry out repairs with your approval.
What is replaced and what does it cost?
With a stretched chain, the mechanic normally replaces the complete timing kit, not only the chain. All parts of the drive wear together. Which parts are in the kit differs by engine. A new chain on worn sprockets wears out faster.
The cost varies a lot by engine. According to the ANWB, replacing a chain costs more than replacing a belt. The chain itself is more expensive and often harder to reach, so more labour is needed. For comparison, the ANWB puts the cost of replacing a timing belt at around € 300 to € 1,000 (consulted November 2026). More on that in timing belt replacement cost. We tell you the price for your car in advance. Call +31 10 479 00 00 with your registration number (kenteken) to hand.
If bits of the guides come out with the oil during an oil change, it is wise to check and clean the oil sump as well. Loose pieces can block the pickup strainer of the oil pump.
How do you know whether your car has a chain or a belt?
It is in the owner’s manual or the service schedule of your car. If it lists a replacement interval for the timing belt, your engine has a belt. If it lists no interval for the timing drive, the engine usually has a chain. The engine code gives certainty. If you are not sure, we look it up from your registration number. More explanation is in timing belt or timing chain: which does your car have?
If you are buying a used car with a chain, the ANWB advises checking whether the model is known for timing chain problems and whether the chain has already been replaced or modified. Ask for the invoice. On the test drive, also listen for rattling noises after a cold start.
How do you prevent the timing chain from stretching?
The best protection is oil of the correct specification, changed on time and kept at the right level. That does not prevent wear completely, but it does slow it down.
- Have the car serviced according to the manufacturer’s schedule. If you make lots of short trips, ask whether a shorter oil change interval makes sense.
- Use oil that meets the specification in your owner’s manual.
- Check the oil level regularly, for example every month or before a long journey.
- Pay attention to new noises on a cold start and have them checked quickly.
During a car service we change the oil to the manufacturer’s specification and replace the oil filter. If the mechanic hears an unusual noise, he tells you.