2018 BMW M4: common problems and what to check
What gets flagged at MOT on 2018 BMW M4s, from 1,992 tests in 2025, plus known faults and what to look at before you buy one.
What stands out
Parts flagged at MOT more often on 2018 BMW M4s than on all cars registered in 2018.
- Coil springs2.8× usualBMW M44.8% All 2018 cars1.7%
Failed outright at MOT: 4.3%, against 1.3% of all 2018 cars. The rest were advisories or minor defects.
Rough price £175–£400 (pair, one axle) ClickMechanicAt the viewing: Look behind each wheel for a snapped spring coil, and listen for a clunk or twang when turning the wheel lock to lock with the car stopped.
Brake pads: 1.7% here, against 11% of all 2018 cars. Brake discs: 5.2% here, against 10.8% of all 2018 cars.
By area
The share of 2018 BMW M4 MOT tests where testers flagged each area, as a fail or an advisory. Rough prices are typical independent-garage costs.
- Tyres21% of testsRough price £70–£150
At the viewing: Check the tread on all four tyres, including the inside edges, and look for cracks or bulges.
- Brakes7% of testsRough price £150–£350
At the viewing: Look for a lip on the disc edges and feel for judder or pulling when braking firmly from about 40mph.
- Suspension7% of testsRough price £120–£400
At the viewing: Listen for knocks over speed bumps, and look behind each front wheel for a snapped coil spring.
- Wipers, windscreen and mirrors3% of testsRough price £15–£250
At the viewing: Check for chips in the driver's view, and test the wipers and washers.
- Oil and fluid leaks2% of testsRough price £80–£600
At the viewing: Look under the engine and on the ground where the car is usually parked for fresh oil or fluid.
- Lights and electrics1% of testsRough price £10–£80
At the viewing: Ask a friend to check every light, including brake lights and indicators, while you operate them.
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Other years
| Year | MOT tests | Most flagged |
|---|---|---|
| 2022 | 1,452 | Tyres 18% |
| 2021 | 954 | Tyres 17% |
| 2020 | 1,154 | Tyres 20% |
| 2019 | 1,714 | Tyres 20% |
| 2017 | 1,937 | Tyres 21% |
| 2016 | 1,691 | Tyres 21% |
| 2015 | 1,800 | Tyres 21% |
| 2014 | 914 | Tyres 19% |
Where this comes from: the DVSA's anonymised results for every MOT test in Great Britain in 2025, counting tests of 2018 BMW M4s registered in 2018. "Flagged" includes advisories, so it isn't the same as a fail rate. How we score