BMW 635 MOT Failures
An analysis of 4,930 real DVSA MOT tests on the BMW 635 — what fails, how often, and how that compares to every other car on UK roads.
Where the BMW 635 fails its MOT
The single biggest MOT failure point on the BMW 635 is subframe bushes or mounts worn — this model is 19 times more likely to fail on this item than the average car on UK roads. That makes it a significant weak point for anyone buying or owning this model. Across 4,930 MOT tests, 8.29% of all BMW 635 tests recorded this as a failure.
Suspension failures typically mean worn bushes, drop links, or dampers. These affect handling and tyre wear. Budget £150–£400 per corner at an independent garage for full suspension overhaul.
Other notable weak points include structural corrosion (11x the fleet average), brake hoses perished or damaged (7.0x the fleet average), any fracture or welding defect on a wheel (26x the fleet average), and service brake efficiency below minimum requirement (13x the fleet average). These ratios compare the BMW 635'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: Suspension, Bodywork, Brakes, Wheels, Lights & Electrics and others. If you're inspecting a BMW 635 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 635'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.
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 635 specifically, the DVSA data shows the most common failures at this mileage are structural corrosion (11x the average) and anti-roll bar links worn (7.7x). brake hoses perished or damaged (7.0x) and abs fault (5.2x) 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 635 specifically, the DVSA data shows the most common failures at this mileage are any fracture or welding defect on a wheel (26x the average) and subframe bushes or mounts worn (14x). service brake efficiency below minimum requirement (13x) and electrical wiring fault (6.8x) also appear frequently.
The shift from structural corrosion at lower mileages to any fracture or welding defect on a wheel 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 635
Based on the MOT failure data and known issues above, here's what to prioritise when inspecting a BMW 635:
Suspension — check for subframe bushes or mounts worn, anti-roll bar links worn. Bodywork — check for structural corrosion. Brakes — check for brake hoses perished or damaged, service brake efficiency below minimum requirement. Wheels — check for any fracture or welding defect on a wheel.
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 635?
Enter the reg to see its full MOT history, mileage records, write-off status, and finance checks.
BMW 635 MOT FAQs
What are the most common MOT failures on a BMW 635?
Based on 4,930 DVSA MOT tests, the most common failure is subframe bushes or mounts worn — at 19x the national fleet average. Other frequent failures include structural corrosion and brake hoses perished or damaged.
Is the BMW 635 reliable based on MOT data?
The BMW 635 has 10 categories where it fails more often than average. The main concern is subframe bushes or mounts worn. 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 635 most commonly fails on any fracture or welding defect on a wheel and subframe bushes or mounts worn. Under 60,000 miles, the main issues are .
How do I check a BMW 635'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.