BMW 8 Series MOT Failures
An analysis of 7,852 real DVSA MOT tests on the BMW 8 Series — what fails, how often, and how that compares to every other car on UK roads. Generations covered: G15 (2018–2024).
Where the BMW 8 Series fails its MOT
The single biggest MOT failure point on the BMW 8 Series is tyre cords visible or damaged — this model is 10 times more likely to fail on this item than the average car on UK roads. That makes it worth watching for anyone buying or owning this model. Across 7,852 MOT tests, 6.08% of all BMW 8 Series tests recorded this as a failure.
Tyre failures indicate either poor maintenance or suspension geometry issues causing uneven wear. Check all four tyres for tread depth, sidewall damage, and uneven wear patterns.
Other notable weak points include transmission shaft flexible coupling deteriorated (225x the fleet average) and emissions failure (5.5x the fleet average). These ratios compare the BMW 8 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 3 categories: Tyres, Bodywork, Exhaust & Emissions. If you're inspecting a BMW 8 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.
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 8 Series specialists and owners flag most frequently, drawn from manufacturer technical bulletins, workshop data, and verified owner reports.
Driveshaft flexible coupling failure (G15) Dangerous
The driveshaft flexible coupling (also called a giubo or flex disc) connects the transmission output to the propshaft on rear-wheel drive BMWs. Affects G15.
Excessive steering free play (G15) Dangerous
MOT data shows the G15 fails at 130 times the fleet average for excessive steering free play, specifically affecting 4.4 petrol variants at higher mileages. Affects G15; typical independent garage repair cost is £300–£600.
Premature suspension component wear (G15) Major
MOT statistics show the G15 fails at up to 124 times the fleet average for worn suspension pins, bushes, and joints, with over 1,000 recorded failures across the 4.4 petrol variants. Affects G15; typical independent garage repair cost is £400–£800.
Coolant system leaks (G15) Major
US NHTSA data also documents coolant tank leakage issues. Affects G15; typical independent garage repair cost is £200–£600.
For the complete picture — including repair costs across independent, specialist, and dealer garages — see the full BMW 8 Series common problems breakdown.
What to check before buying a BMW 8 Series
Based on the MOT failure data and known issues above, here's what to prioritise when inspecting a BMW 8 Series:
Tyres — check for tyre cords visible or damaged. Bodywork — check for transmission shaft flexible coupling deteriorated. Exhaust & Emissions — check for emissions failure.
Beyond the MOT items, ask specifically about driveshaft flexible coupling failure and excessive steering free play. 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 8 Series?
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BMW 8 Series MOT FAQs
What are the most common MOT failures on a BMW 8 Series?
Based on 7,852 DVSA MOT tests, the most common failure is tyre cords visible or damaged — at 10x the national fleet average. Other frequent failures include transmission shaft flexible coupling deteriorated and emissions failure.
Is the BMW 8 Series reliable based on MOT data?
The BMW 8 Series has 3 MOT failure categories above the fleet average. Specialists also flag driveshaft flexible coupling failure as a concern. A pre-purchase inspection and service history check are recommended.
What MOT failures should I expect at high mileage?
The most common high-mileage failures include tyre cords visible or damaged, transmission shaft flexible coupling deteriorated, emissions failure.
How do I check a BMW 8 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.