BMW 6 Series MOT Failures
An analysis of 20,078 real DVSA MOT tests on the BMW 6 Series — what fails, how often, and how that compares to every other car on UK roads. Generations covered: E24 (1981–1989), E63 (2004–2010), F06 (2012–2018), F12 (2011–2018).
Where the BMW 6 Series fails its MOT
The single biggest MOT failure point on the BMW 6 Series is transmission shaft flexible coupling deteriorated — this model is 149 times more likely to fail on this item than the average car on UK roads. That makes it an extreme outlier for anyone buying or owning this model. Across 20,078 MOT tests, 2.67% of all BMW 6 Series tests recorded this as a failure.
Bodywork failures usually mean structural corrosion — not cosmetic rust, but rot that affects the car's structural integrity. Check sills, subframes, and chassis rails carefully, especially on older examples.
Other notable weak points include headlight fault (44x the fleet average), any fracture or welding defect on a wheel (27x the fleet average), anti-roll bar links worn (7.2x the fleet average), and tyre cords visible or damaged (6.4x the fleet average). These ratios compare the BMW 6 Series's failure rate on each item against the national average for all cars tested — a ratio of 10x means this model fails ten times more often than a typical car.
The failures span 6 categories: Bodywork, Lights & Electrics, Wheels, Suspension, Tyres and others. If you're inspecting a BMW 6 Series before purchase, these are the areas to focus on — and if any have been flagged as advisories on a previous MOT, they're likely to become failures in the near future.
How failures change with mileage
The BMW 6 Series's weak points shift as the car covers more miles. Understanding these patterns helps you know what to expect — and what to budget for — at each stage of ownership.
Under 60,000 miles
At this mileage, most failures are either design-related or caused by age rather than wear. Components like bushes and drop links may not have been replaced yet, and original-fit parts can deteriorate even on low-mileage cars that spend a lot of time sitting.
For the BMW 6 Series specifically, the DVSA data shows the most common failures at this mileage are transmission shaft flexible coupling deteriorated (149x the average) and any fracture or welding defect on a wheel (15x). tyre cords visible or damaged (6.4x) and emissions failure (5.6x) also appear frequently.
60,000 to 100,000 miles
This is where routine wear items start to show up. Brake components, tyres, and exhaust parts have done serious work by this point. Cars that have been well serviced will show fewer of these failures — this mileage band is where good maintenance really separates the well-kept from the neglected.
For the BMW 6 Series specifically, the DVSA data shows the most common failures at this mileage are transmission shaft flexible coupling deteriorated (71x the average) and headlight fault (44x). any fracture or welding defect on a wheel (27x) and any fracture or welding defect on a wheel also appear frequently.
Over 100,000 miles
High-mileage cars accumulate failures across multiple systems. The key question isn't whether things will need doing — they will — but whether the car has been maintained well enough to keep on top of them. Look for a consistent service history and recent MOT passes with minimal advisories.
For the BMW 6 Series specifically, the DVSA data shows the most common failures at this mileage are transmission shaft flexible coupling deteriorated (24x the average) and anti-roll bar links worn (7.2x). headlight fault (5.3x) and headlight fault also appear frequently.
Known issues beyond the MOT
An MOT only tests roadworthiness at a single point in time — it won't catch developing faults, intermittent problems, or issues that haven't yet reached the failure threshold. These are the issues that BMW 6 Series specialists and owners flag most frequently, drawn from manufacturer technical bulletins, workshop data, and verified owner reports.
Rod bearing failure (E63 S85) Dangerous
The S85 5.0-litre V10 engine uses plain shell bearings between the connecting rods and crankshaft that are undersized for the engine's power output and rpm capability. Affects E63.
Brake pipe corrosion Dangerous
BMW 6 Series models show brake pipe corrosion at 298.2 times the fleet average rate, with particular problems on V8 petrol variants where brake lines run close to exhaust manifolds and turbocharger heat shields. Affects E63, F06/F12; typical independent garage repair cost is £300–£600.
Valve stem seal failure (E63 N62) Major
The N62 4.8-litre V8 uses rubber valve stem seals that harden and shrink with age, allowing engine oil to leak past the valve guides into the combustion chambers. Affects E63.
VANOS issues (E63) Major
VANOS (Variable Nockenwellen Steuerung) is BMW's variable valve timing system using oil pressure to adjust camshaft timing for optimal performance and emissions. Affects E63; typical independent garage repair cost is £400–£600.
For the complete picture — including repair costs across independent, specialist, and dealer garages — see the full BMW 6 Series common problems breakdown.
What to check before buying a BMW 6 Series
Based on the MOT failure data and known issues above, here's what to prioritise when inspecting a BMW 6 Series:
Bodywork — check for transmission shaft flexible coupling deteriorated. Lights & Electrics — check for headlight fault. Wheels — check for any fracture or welding defect on a wheel. Suspension — check for anti-roll bar links worn.
Beyond the MOT items, ask specifically about rod bearing failure and brake pipe corrosion. These won't show up on a standard MOT but can be expensive to fix — A specialist pre-purchase inspection is worth the investment on this model.
Always check the car's full MOT history for patterns — recurring advisories often become failures within 12 months. And verify the service history to confirm maintenance has been kept up to schedule. Enter any reg into our free car check to see the complete picture.
Looking at a specific BMW 6 Series?
Enter the reg to see its full MOT history, mileage records, write-off status, and finance checks.
BMW 6 Series MOT FAQs
What are the most common MOT failures on a BMW 6 Series?
Based on 20,078 DVSA MOT tests, the most common failure is transmission shaft flexible coupling deteriorated — at 149x the national fleet average. Other frequent failures include headlight fault and any fracture or welding defect on a wheel.
Is the BMW 6 Series reliable based on MOT data?
The BMW 6 Series has 6 MOT failure categories above the fleet average. Specialists also flag rod bearing failure as a concern. A pre-purchase inspection and service history check are recommended.
What MOT failures should I expect at high mileage?
Above 100,000 miles, the BMW 6 Series most commonly fails on transmission shaft flexible coupling deteriorated and anti-roll bar links worn. Under 60,000 miles, the main issues are transmission shaft flexible coupling deteriorated and any fracture or welding defect on a wheel.
How do I check a BMW 6 Series's MOT history?
Enter the registration number into our free car check above. You'll see every MOT test result, advisories and failures, mileage readings, write-off status, and finance checks.
MOT failure data sourced from DVSA bulk test records via data.gov.uk. Ratios compare this model's failure rate against the national fleet average. Known issues sourced from manufacturer bulletins, specialist workshops, and verified owner reports.