BMW 640 MOT Failures
An analysis of 194,447 real DVSA MOT tests on the BMW 640 — what fails, how often, and how that compares to every other car on UK roads.
Where the BMW 640 fails its MOT
The single biggest MOT failure point on the BMW 640 is transmission shaft flexible coupling deteriorated — this model is 54 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 194,447 MOT tests, 1.16% of all BMW 640 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 (50x the fleet average), any fracture or welding defect on a wheel (28x the fleet average), tyre seriously damaged (9.6x the fleet average), and tyre has a lump, bulge or tear caused by separa... (24x the fleet average). These ratios compare the BMW 640'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 5 categories: Bodywork, Lights & Electrics, Wheels, Tyres, Wipers & Windscreen. If you're inspecting a BMW 640 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 640'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 640 specifically, the DVSA data shows the most common failures at this mileage are transmission shaft flexible coupling deteriorated (54x the average) and tyre has a lump, bulge or tear caused by separa... (24x). any fracture or welding defect on a wheel (21x) and headlight fault (17x) 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 640 specifically, the DVSA data shows the most common failures at this mileage are transmission shaft flexible coupling deteriorated (35x the average) and any fracture or welding defect on a wheel (18x). headlight fault (18x) and wheel with a loose or missing wheel nut, bolt o... (11x) 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 640 specifically, the DVSA data shows the most common failures at this mileage are headlight fault (30x the average) and any fracture or welding defect on a wheel (22x). transmission shaft flexible coupling deteriorated (20x) and tyre seriously damaged (5.2x) also appear frequently.
The shift from transmission shaft flexible coupling deteriorated at lower mileages to headlight fault 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.
What to check before buying a BMW 640
Based on the MOT failure data and known issues above, here's what to prioritise when inspecting a BMW 640:
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, 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....
Always check the car's full MOT history for patterns — recurring advisories often become failures within 12 months. Enter any reg into our free car check to see the complete picture.
Looking at a specific BMW 640?
Enter the reg to see its full MOT history, mileage records, write-off status, and finance checks.
BMW 640 MOT FAQs
What are the most common MOT failures on a BMW 640?
Based on 194,447 DVSA MOT tests, the most common failure is transmission shaft flexible coupling deteriorated — at 54x the national fleet average. Other frequent failures include headlight fault and any fracture or welding defect on a wheel.
Is the BMW 640 reliable based on MOT data?
The BMW 640 has 7 categories where it fails more often than average. The main concern is transmission shaft flexible coupling deteriorated. Always check a specific car's full history before buying.
What MOT failures should I expect at high mileage?
Above 100,000 miles, the BMW 640 most commonly fails on headlight fault and any fracture or welding defect on a wheel. Under 60,000 miles, the main issues are transmission shaft flexible coupling deteriorated and tyre has a lump, bulge or tear caused by separa....
How do I check a BMW 640'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.