Timing belt · 2026
Mercedes-Benz A-Class timing belt cost
Almost every A-Class engine is chain-driven with no scheduled replacement. The one exception matters a great deal: the 1.5-litre diesel in the A 180 CDI and A 180 d is a rebadged Renault engine and runs a cambelt. Owners often assume Mercedes means chain and never have it changed. No A-Class uses a wet belt. A timing belt change at a UK independent garage typically costs £265–£752 for a Mercedes-Benz A-Class (belt, tensioner and water pump), depending on engine.
What will it cost near you?
£265–£752 is the UK average. See what your local garages charge.
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Does the Mercedes-Benz A-Class have a belt or chain?
It depends on the engine. Here's the belt-vs-chain breakdown for the main UK Mercedes-Benz A-Class engines, with typical manufacturer replacement intervals (always confirm against your own handbook):
| Engine | Type | Interval |
|---|---|---|
1.5 / 1.7 / 2.0 M266 petrol (2004–2012) The W169 A-Class petrols are all chain-driven with no replacement interval. | Timing chain | No set interval |
2.0 CDI OM640 diesel (2004–2012) The W169 diesels use a chain. Note this is a 2.0 — the belt-driven A-Class diesel is the later 1.5. | Timing chain | No set interval |
1.6 / 2.0 M270 petrol (2012–2018) W176 A 160 through A 250 petrols. Chain-driven, nothing scheduled. | Timing chain | No set interval |
1.5 CDI OM607 diesel A 180 CDI (2012–2018) The one to watch. The OM607 is a Renault K9K under a Mercedes code and runs a conventional dry cambelt — kits carry both Mercedes and Renault part numbers. Mercedes publishes no short fixed interval, which is exactly why so many go unchanged; independents generally advise the Renault schedule of roughly six years. Interference engine. | Timing belt | No set interval |
1.8 CDI OM651 diesel A 180 CDI (2012–2014) An early W176 A 180 CDI can be this 1.8 chain engine instead of the 1.5 belt engine — same badge, different engine. Check the capacity on your V5C: 1796cc means chain, 1461cc means belt. | Timing chain | No set interval |
2.1 CDI OM651 diesel A 200 d / A 220 d (2012–2018) Chain-driven. Early OM651s had a known chain-wear issue, so a rattle at start-up is worth investigating even though there is no scheduled change. | Timing chain | No set interval |
1.3 petrol M282 (2018 on) Co-developed with the Renault-Nissan alliance — the same unit as Renault's 1.3 TCe. Single-row chain designed to last the life of the engine. | Timing chain | No set interval |
2.0 petrol M260 / M139 A 220, A 250, AMG (2018 on) Chain-driven, no scheduled replacement. | Timing chain | No set interval |
1.5 diesel OM608 A 180 d (2018–2020) The W177 A 180 d carries the belt over from the W176 — same Renault K9K basis, same dry cambelt, same trap. Mercedes dropped this engine at the end of 2020. | Timing belt | No set interval |
2.0 diesel OM654 A 200 d / A 220 d (2018 on) Mercedes' own 2.0 diesel, chain-driven. This is the diesel most W177 owners have. | Timing chain | No set interval |
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Mercedes-Benz A-Class timing belt cost
For belt engines, a full timing belt service (belt, tensioner and water pump) at a UK independent garage typically costs £265–£752. Main dealers charge 30–50% more. Chain-driven variants have no scheduled change but cost more in labour if a chain fails.
Key things to know
- Only one A-Class engine has a cambelt: the 1.5 diesel, sold as the A 180 CDI (2012–2018) and A 180 d (2018–2020). Everything else is a chain.
- Check the engine capacity on your V5C, not the badge. On the W176 the A 180 CDI badge covers both a 1461cc belt engine and a 1796cc chain engine.
- The 1.5 diesel is a Renault K9K wearing a Mercedes code. If a dealer says there is no belt to change, ask them to check against the OM607/OM608 code.
- No A-Class engine uses a wet belt.
Good question
Questions Okay gets asked a lot
How much does a timing belt cost for a Mercedes-Benz A-Class?
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A timing belt replacement on a Mercedes-Benz A-Class typically costs £265–£752 at a UK independent garage in 2026, covering the belt, tensioner and water pump together. The exact figure depends on the engine and your area; main dealers charge more. Use our cost calculator to estimate the price for your specific car and region.
Why does the A 180 d have a cambelt when other Mercedes diesels have chains?
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Because it is not really a Mercedes engine. To meet emissions and cost targets in the smallest diesel slot, Mercedes used Renault's 1.5-litre dCi, coded OM607 in the 2012–2018 A-Class and OM608 in the 2018–2020 car. It kept Renault's conventional dry cambelt, and replacement kits carry both Mercedes and Renault part numbers. Because Mercedes does not advertise a short fixed change interval, plenty of these cars reach high mileage on an original belt. It is an interference engine, so a failure is usually terminal — worth a proactive check.
What happens if the timing belt snaps on a Mercedes-Benz A-Class?
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Its belt-driven engines are interference designs, which means if the belt snaps the pistons strike the open valves. That causes bent valves and often piston and cylinder-head damage — a repair that frequently runs to four figures and can write off an older car. This is why replacing the belt on schedule, by age as well as mileage, is far cheaper than risking a failure.
Get a price for your Mercedes-Benz A-Class
Estimate the timing belt cost for your exact engine and region, then compare quotes from trusted local garages.