BMW 5 Series MOT Failures
An analysis of 652,700 real DVSA MOT tests on the BMW 5 Series — what fails, how often, and how that compares to every other car on UK roads. Generations covered: E39 (1995–2004), E60 (2003–2010), F10 (2010–2017), G30 (2017–2023).
Where the BMW 5 Series fails its MOT
The single biggest MOT failure point on the BMW 5 Series is transmission shaft flexible coupling deteriorated — this model is 86 times more likely to fail on this item than the average car on UK roads. That makes it a major concern for anyone buying or owning this model. Across 652,700 MOT tests, 0.99% of all BMW 5 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 any fracture or welding defect on a wheel (75x the fleet average), tyre seriously damaged (7.6x the fleet average), headlight fault (31x the fleet average), and fluid leak (49x the fleet average). These ratios compare the BMW 5 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, Wheels, Tyres, Lights & Electrics, Suspension and others. If you're inspecting a BMW 5 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 5 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 5 Series specifically, the DVSA data shows the most common failures at this mileage are transmission shaft flexible coupling deteriorated (86x the average) and any fracture or welding defect on a wheel (75x). tyre has a lump, bulge or tear caused by separa... (15x) and window tint too dark (15x) 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 5 Series specifically, the DVSA data shows the most common failures at this mileage are transmission shaft flexible coupling deteriorated (45x the average) and any fracture or welding defect on a wheel (23x). headlight fault (17x) and brake hoses perished or damaged (12x) 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 5 Series specifically, the DVSA data shows the most common failures at this mileage are fluid leak (49x the average) and headlight fault (23x). transmission shaft flexible coupling deteriorated (14x) and any fracture or welding defect on a wheel (11x) also appear frequently.
The shift from transmission shaft flexible coupling deteriorated at lower mileages to fluid leak at higher mileages is typical — early failures tend to be design or factory-related, while high-mileage failures reflect accumulated mechanical wear. A car that's been well maintained will usually dodge the worst of both.
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 5 Series specialists and owners flag most frequently, drawn from manufacturer technical bulletins, workshop data, and verified owner reports.
Rod bearing failure (engine destroyer) (E60) Dangerous
The S85 5.0-litre V10 engine suffers from premature rod bearing failure, typically between 30,000-80,000 miles. Affects E60.
Timing chain failure (F10) Dangerous
The N47 diesel engine has a rear-mounted timing chain that is prone to stretching and complete failure, typically between 40,000-100,000 miles. Affects F10; typical independent garage repair cost is £2,000–£3,000.
Timing chain guide failure (F10) Dangerous
The N20 four-cylinder turbo engine suffers from timing chain guide disintegration, typically between 40,000-100,000 miles. Affects F10; typical independent garage repair cost is £1,500–£2,500.
Swirl flap failure (engine destroyer) (E39) Dangerous
The M57 diesel engine has plastic swirl flaps in the intake manifold that can break off and be ingested by the engine, causing catastrophic internal damage. Affects E39; typical independent garage repair cost is £400–£800.
For the complete picture — including repair costs across independent, specialist, and dealer garages — see the full BMW 5 Series common problems breakdown.
What to check before buying a BMW 5 Series
Based on the MOT failure data and known issues above, here's what to prioritise when inspecting a BMW 5 Series:
Bodywork — check for transmission shaft flexible coupling deteriorated. Wheels — check for any fracture or welding defect on a wheel, wheel with a loose or missing wheel nut, bolt o.... Tyres — check for tyre seriously damaged, tyre has a lump, bulge or tear caused by separa.... Lights & Electrics — check for headlight fault.
Beyond the MOT items, ask specifically about rod bearing failure and timing chain failure. 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 5 Series?
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BMW 5 Series MOT FAQs
What are the most common MOT failures on a BMW 5 Series?
Based on 652,700 DVSA MOT tests, the most common failure is transmission shaft flexible coupling deteriorated — at 86x the national fleet average. Other frequent failures include any fracture or welding defect on a wheel and tyre seriously damaged.
Is the BMW 5 Series reliable based on MOT data?
The BMW 5 Series has 15 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 5 Series most commonly fails on fluid leak and headlight fault. 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 5 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.