2012 BMW 3 Series: common problems and what to check
What gets flagged at MOT on 2012 BMW 3 Seriess, from 30,461 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 2012 BMW 3 Seriess than on all cars registered in 2012.
- Shock absorbers2.1× usualBMW 3 Series13.7% All 2012 cars6.5%Rough price £150–£400
At the viewing: Push down hard on each corner. It should bounce once and settle. Look for oil on the shock absorber body.
- Steering rack inner joints3.9× usualBMW 3 Series8.9% All 2012 cars2.3%Rough price £80–£450
At the viewing: On a straight road the steering wheel should sit straight. Listen for knocks when turning, and check the steering feels even.
- Link ball joint covers1.7× usualBMW 3 Series4.3% All 2012 cars2.5%Rough price £80–£200
At the viewing: Listen for knocking over bumps and check the rubber boots behind the wheels aren't split.
- Side repeaters2× usualBMW 3 Series2.4% All 2012 cars1.2%Rough price £10–£80
At the viewing: Ask a friend to check every light, including brake lights and indicators, while you operate them.
Number plate lights: 0.3% here, against 7.3% of all 2012 cars. Coil springs: 4.4% here, against 9.6% of all 2012 cars.
By area
The share of 2012 BMW 3 Series MOT tests where testers flagged each area, as a fail or an advisory. Rough prices are typical independent-garage costs.
- Suspension32% 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.
- Tyres32% 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.
- Brakes24% 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.
- Lights and electrics19% of testsRough price £10–£80
At the viewing: Ask a friend to check every light, including brake lights and indicators, while you operate them.
- Steering10% of testsRough price £100–£450
At the viewing: On a straight road the steering wheel should sit straight. Feel for play or knocking when turning.
- Wipers, windscreen and mirrors8% of testsRough price £15–£250
At the viewing: Check for chips in the driver's view, and test the wipers and washers.
Known faults
Reported by owners, mechanics and buying guides for this model and age. Check which engine the car has, as some apply to one engine only.
- Timing chain wear2.0 petrol and diesel
The four-cylinder petrol and diesel engines can suffer timing chain wear, especially with late oil changes. A failed chain is an engine-out repair.
At the viewing: Listen for a rattle or whine from the back of the engine, especially from cold. Ask for oil changes on time.
- Blocked EGR valve or particulate filter (diesel)Diesel
Diesels used mostly for short trips can block the EGR valve or clog the particulate filter, causing poor running.
At the viewing: Ask what journeys it’s done and watch for warning lights or a lack of power.
- Noisy differential
A whine from the rear as the car passes you can mean the differential has been neglected.
At the viewing: Ask someone to drive it past you slowly and listen for a whine from the back.
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Other years
| Year | MOT tests | Most flagged |
|---|---|---|
| 2019 | 11,430 | Tyres 25% |
| 2018 | 8,504 | Tyres 26% |
| 2016 | 24,243 | Tyres 27% |
| 2015 | 30,049 | Tyres 29% |
| 2014 | 29,426 | Tyres 31% |
| 2013 | 31,654 | Tyres 30% |
| 2011 | 24,841 | Tyres 34% |
| 2010 | 22,691 | Suspension 38% |
| 2009 | 20,166 | Suspension 40% |
| 2008 | 19,093 | Suspension 42% |
Where this comes from: the DVSA's anonymised results for every MOT test in Great Britain in 2025, counting tests of 2012 BMW 3 Seriess registered in 2012. "Flagged" includes advisories, so it isn't the same as a fail rate. How we score