Petrol engines with known problems in used cars
Some petrol engines in common UK used cars have a recall, a service action or a buying-guide warning: a cylinder head that can crack, a coolant hose that can split, and timing chains that wear early on some engines. Here's which engines, which cars and years, what Ford did about its two, and what to check before you buy.
By Michał Żelazko
Car enthusiast
Updated
First published
Quick answer
Some petrol engines have documented problems. Ford recalled 1.6 EcoBoost cars built from 2010 to 2014 over cylinder head cracks, and ran a service action on 1.0 EcoBoost engines built in 2011–2013 over a coolant hose. Parkers warns of timing chain trouble on Volkswagen's chain-driven 1.2 TSI, BMW's N20 and some Mercedes petrols.
Key takeaways
- Ford recalled 1.6 EcoBoost cars built from June 2010 to December 2014 because the cylinder head can crack and leak oil, so check the registration on GOV.UK's recall service.
- Timing chains on engines such as Volkswagen's 1.2 TSI, BMW's N20 and the second-generation MINI's petrols can cause trouble, especially when oil runs low or changes are late, and a rattle at start-up is the usual warning.
- Before you buy, confirm the engine, hear it start from cold, and check that the service history shows oil changes on time.
See what CarCanny finds on the car you're looking at.
Which petrol engines have known problems?
Ford's 1.6 and early 1.0 EcoBoost have a recall and a service action on record. Parkers' buying guides also warn about Volkswagen's chain-driven TSI engines, BMW's N20, the second-generation MINI's petrols, the Mercedes W204 C-Class's six-cylinder petrols, Renault's 0.9 TCe and the petrols in the 2008–2015 Audi A4. The list is in no order: we know of no dataset that ranks engines by how often they fail.
| Engine | Found in | The problem | Remedy or what to check |
|---|---|---|---|
| Ford 1.6 EcoBoost | Focus, C-Max, Kuga and Fiesta ST built from 2 June 2010 to 20 December 2014 | The cylinder head can overheat in one area and crack, causing an oil leak that in extreme cases could start a fire | DVSA safety recall in January 2018: new parts and a coolant level warning |
| Ford 1.0 EcoBoost, built October 2011 to October 2013 | Fiesta, Focus and other Fords | A plastic coolant hose can split, so the engine overheats | Ford service action from March 2015; Ford said in 2018 that 96% of affected cars had been reworked. Check the hose was modified |
| Volkswagen 1.2 and 1.4 TSI with a timing chain | Polo Mk5 1.2 TSI with a timing chain (confirm the engine: Parkers says new engines came with the 2014 facelift), Golf Mk5 1.4 TSI (2006–2009) | The Polo's chain can rattle and eventually fail; on the Golf, listen for rattles and check for stretch | Listen for a rattle at start-up; ask whether the chain has been changed |
| BMW N20 four-cylinder petrol | 3 Series F30 with an N20 engine (confirm the engine code) | Timing chain trouble, worse when oil changes are late | Listen for rattles and whines; check the oil was changed on time |
| MINI petrol engines, second generation | MINI Hatch R56 (2006–2014) | Chains and guides wear if the oil runs low; high oil use can kill the turbo | A rattle from a cold start is the sign to walk away |
| Mercedes six-cylinder petrols | C-Class W204 (2007–2014) | Parkers calls the engines generally reliable, but says this chain can stretch early, even on a low-mileage car | Check when the chain is due, and negotiate if it's soon |
| Renault 0.9 TCe | Clio, fourth generation (2012–2019) | The timing chain needs changing by 100,000 miles; a chattering sound suggests it has stretched | On a high-miler, ask for proof the chain was changed |
| Audi petrol engines | A4 B8 (2008–2015) | Parkers says petrols can be known for above-average oil use | Check the oil level, and look for fresh spilt oil from top-ups |
Checked against DVSA's recall records, Parkers' used buying guides and Autocar's report of Ford's statements on 30 October 2026. Not every car with these engines will have a problem. Engines that run their timing belt in oil, such as the 1.2 PureTech and the 1.0 EcoBoost, have a separate belt problem that we cover in its own guide. Contains public sector information licensed under the Open Government Licence v3.0.
Ford 1.6 EcoBoost
In January 2018 Ford recalled 15,228 vehicles through DVSA (recall R/2018/008) because local overheating can crack the cylinder head, causing a pressurised oil leak that could, in extreme cases, start a fire in the engine bay. The remedy is an inspection, new engine and cooling parts where needed, and a coolant level sensor that warns the driver. DVSA's record lists the Focus, C-Max, Kuga and Fiesta ST built from 2 June 2010 to 20 December 2014, and Autocar's 2018 report ties the recall to the 1.6-litre engine. Ford described the affected share as a small percentage.
Ford 1.0 EcoBoost, 2011 to 2013
On 1.0 EcoBoost engines built from October 2011 to October 2013, a coolant hose can fail at high temperatures, Ford said in 2018, Autocar reported. Ford said 44,682 cars were affected, that it started a service action in March 2015 and that 96% of them had been reworked. It said DVSA didn't class this as a safety issue because the driver is warned if the engine overheats. Parkers calls the part the degas hose and says to check it has been modified, because a split can destroy the engine. In 2018 Ford said it would pay the full cost of repairs it linked to overheating of the 1.0-litre engine.
Volkswagen 1.2 and 1.4 TSI with a timing chain
Parkers says the chain-driven 1.2 TSI in the Mk5 Polo has a timing chain that should, in theory, never need changing, but that it can become rattly, especially at start-up, and eventually fail and wreck the engine. Some advise changing it as often as every four years or 40,000 miles. On the 2004–2009 Golf Mk5, the 1.4 TSI and FSI engines also have a chain: listen for rattles at start-up and idle, and a garage with a diagnostic computer can check for stretch. The Polo GTI's original 1.4 TSI twincharger can also use a lot of oil, so check it hasn't been run low.
BMW N20
Every engine in the 2012–2019 3 Series (F30) has a timing chain, and Parkers says the four-cylinder N20 petrols are the most troublesome, especially when oil changes haven't been done on schedule. Listen for rattles and whines from the engine.
MINI R56 petrols
Parkers' guide to the second-generation MINI Hatch (2006–2014) links timing chain and guide wear to neglected cars that have been run short of oil, and warns that heavy oil use on Cooper models can also destroy the turbocharger. Ask the seller not to warm the car up, and treat a rattle at a cold start as a reason to walk away.
Mercedes C-Class W204 six-cylinder petrols
Parkers says the 2007–2014 C-Class has an excellent reputation for reliability and its engines are generally reliable. Its warning is on the six-cylinder petrols, where timing chains could stretch early, whatever the mileage. A new chain is costly, so find out when one is due before you agree a price.
Renault 0.9 TCe and Audi A4 petrols
Parkers lists a timing chain change at least every 100,000 miles on the 2012–2019 Clio's 0.9 TCe, and says a chattering noise on a higher-mileage car suggests stretch. On the 2008–2015 Audi A4, it says petrols can be known for above-average oil use: read the electronic oil gauge and, if you can, look under the engine cover for fresh oil, which can mean a recent top-up.
Why do timing chains stretch?
A timing chain is meant to last the engine's life, but on some engines it wears early, and oil that runs low or is changed late makes it worse, Parkers' guides to the MINI and BMW 3 Series say. The warning sign is a rattle, especially in the first seconds after a cold start, which is why Parkers' guides to the Golf, Polo, MINI and 3 Series all say to listen for one. A stretched chain left alone can jump out of time and wreck the engine.
What is carbon build-up in a petrol engine?
It's deposits that form inside the engine and can make it run badly. Parkers says misfiring at idle and reluctance to start can point to carbon build-up on the 1.0 EcoBoost in the 2008–2017 Fiesta, and that the later direct-injection petrols in the W204 C-Class, badged CGI, are more prone to it and best run on high-quality fuel.
How do I check a used petrol car for engine problems?
Confirm the engine, hear it start from cold, then check its history.
Confirm the engine
Our free check shows the car's engine size from its record, to compare with its logbook. The V5C, or a dealer's check of the VIN, confirms the exact engine.
Start it from cold
Ask the seller not to run the engine before you arrive, and listen for a rattle in the first few seconds after it starts.
Read the service history
Look for oil changes on time and any timing chain replacement, with receipts.
Check the oil
A low level, or fresh oil spilt around the filler, can mean the engine uses oil.
Ask about recall and service work
For a 1.6 EcoBoost built up to December 2014, enter the registration on GOV.UK's recall check to see whether recall R/2018/008 is still open. For a 1.0 EcoBoost built in 2011–2013, ask a Ford dealer whether the coolant hose was modified.
Read the MOT history
Look for repeat advisories, such as oil leaks, and check that the mileage at each MOT fits the service stamps.
CarCanny's full report shows every MOT test with its mileage and the tester's advisories, and checks whether the mileage ever went down between MOT tests, so you can match the service history to the miles. It also checks finance, write-off and stolen.
GOV.UK's free recall service lists safety recalls by make, model and year. On 30 October 2026 it showed recall R/2018/008 for the 2013 Ford Focus and Kuga. To see whether a particular car still has a recall open, enter its registration on GOV.UK's recall check, and ask a Ford dealer to confirm the work.
Frequently asked questions
What are the top 10 worst engines to avoid?
We know of no dataset that ranks engines by how often they fail, so we don't publish a top 10, and the engines in this article aren't a list of the worst. How the car you're looking at was kept matters too, so check its service history and hear it start from cold.
What are the most reliable petrol engines?
Without data that compares engines fairly, we don't name one. How a car was kept matters more than its engine's name: one with oil changes on time and no rattle from a cold start is a safer buy than a neglected car with an engine that has a good name.
Is a 1L or 1.2 L engine better?
Neither size is better in itself: it depends on the engine. Among 1.0-litre engines, Ford's EcoBoost built in 2011–2013 had a coolant hose fault, and among 1.2-litre engines, Volkswagen's chain-driven 1.2 TSI can have timing chain trouble. Find out which engine the car has, then check its history.
Sources
- GOV.UK (DVSA): Vehicle recalls, Ford Focus 2013, recall R/2018/008 (8 January 2018)(opens in a new tab)
- Autocar: Ford Ecoboost engine failures: customers to receive refunds (1 October 2018)(opens in a new tab)
- Parkers: Ford Focus (2011–2018) used car buying guide (updated 20 March 2026)(opens in a new tab)
- Parkers: Ford Fiesta Mk7 (2008–2017) used car buying guide (updated 19 March 2026)(opens in a new tab)
- Parkers: Volkswagen Polo Mk5 (2009–2017) used review and buying guide (updated 15 September 2025)(opens in a new tab)
- Parkers: Volkswagen Golf Mk5 (2004–2009) used review and buying guide (updated 15 September 2025)(opens in a new tab)
- Parkers: BMW 3 Series (2012–2019) used car buying guide (updated 10 March 2026)(opens in a new tab)
- Parkers: MINI Hatch (R56) used car buying guide (updated 15 September 2025)(opens in a new tab)
- Parkers: Mercedes-Benz C-Class Saloon (2007–2014) used review (updated 15 September 2025)(opens in a new tab)
- Parkers: Renault Clio Hatchback (2012–2019) used review (updated 24 September 2025)(opens in a new tab)
- Parkers: Audi A4 Saloon (2008–2015) used review (updated 26 March 2026)(opens in a new tab)
The ideas for our guides come from people on our team. We use AI tools to help research, draft and edit them, and the named author reads each one before it's published.
Written by
Michał Żelazko
Car enthusiast at CarCanny
Michał works at vlayer, the company behind CarCanny, and is a motoring fan after hours.
