Mercedes Benz Unclassified MOT Failures
An analysis of 656 real DVSA MOT tests on the Mercedes Benz Unclassified — what fails, how often, and how that compares to every other car on UK roads.
Where the Mercedes Benz Unclassified fails its MOT
The single biggest MOT failure point on the Mercedes Benz Unclassified is transmission shaft flexible coupling deteriorated — this model is 720 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 656 MOT tests, 7.47% of all Mercedes Benz Unclassified 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 abs fault (6.4x the fleet average) and obligatory mirror or device slightly damaged or... (6.0x the fleet average). These ratios compare the Mercedes Benz Unclassified'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: Bodywork, Suspension, Wipers & Windscreen. If you're inspecting a Mercedes Benz Unclassified 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 Mercedes Benz Unclassified'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.
The standout failure at this mileage is transmission shaft flexible coupling deteriorated at 720x the fleet average.
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 Mercedes Benz Unclassified specifically, the DVSA data shows the most common failures at this mileage are abs fault (6.4x the average) and obligatory mirror or device slightly damaged or... (6.0x).
The shift from transmission shaft flexible coupling deteriorated at lower mileages to abs 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 Mercedes Benz Unclassified
Based on the MOT failure data and known issues above, here's what to prioritise when inspecting a Mercedes Benz Unclassified:
Bodywork — check for transmission shaft flexible coupling deteriorated. Suspension — check for abs fault. Wipers & Windscreen — check for obligatory mirror or device slightly damaged or....
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 Mercedes Benz Unclassified?
Enter the reg to see its full MOT history, mileage records, write-off status, and finance checks.
Mercedes Benz Unclassified MOT FAQs
What are the most common MOT failures on a Mercedes Benz Unclassified?
Based on 656 DVSA MOT tests, the most common failure is transmission shaft flexible coupling deteriorated — at 720x the national fleet average. Other frequent failures include abs fault and obligatory mirror or device slightly damaged or....
Is the Mercedes Benz Unclassified reliable based on MOT data?
The Mercedes Benz Unclassified has 3 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 Mercedes Benz Unclassified most commonly fails on abs fault and obligatory mirror or device slightly damaged or.... Under 60,000 miles, the main issues are transmission shaft flexible coupling deteriorated.
How do I check a Mercedes Benz Unclassified'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.