Mercedes Benz X MOT Failures
An analysis of 46,332 real DVSA MOT tests on the Mercedes Benz X — what fails, how often, and how that compares to every other car on UK roads.
Where the Mercedes Benz X fails its MOT
The single biggest MOT failure point on the Mercedes Benz X is anti-roll bar links worn — this model is 16 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 46,332 MOT tests, 2.04% of all Mercedes Benz X 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 emissions failure (13x the fleet average), light unit fault (9.1x the fleet average), parking brake efficiency below minimum requirement (13x the fleet average), and parking brake inoperative on one side (24x the fleet average). These ratios compare the Mercedes Benz X'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, Exhaust & Emissions, Seatbelts & Airbags, Brakes, Bodywork and others. If you're inspecting a Mercedes Benz X 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 X'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 Mercedes Benz X specifically, the DVSA data shows the most common failures at this mileage are body panel damage (129x the average) and parking brake inoperative on one side (24x). anti-roll bar links worn (16x) and parking brake efficiency below minimum requirement (13x) 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 Mercedes Benz X specifically, the DVSA data shows the most common failures at this mileage are emissions failure (9.7x the average) and light unit fault (8.7x). anti-roll bar links worn (6.8x) and tyre wear or damage (5.6x) 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.
The standout failure at this mileage is anti-roll bar links worn at 9.9x the fleet average.
The shift from body panel damage at lower mileages to anti-roll bar links worn 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 X
Based on the MOT failure data and known issues above, here's what to prioritise when inspecting a Mercedes Benz X:
Suspension — check for anti-roll bar links worn. Exhaust & Emissions — check for emissions failure. Seatbelts & Airbags — check for light unit fault. Brakes — check for parking brake efficiency below minimum requirement, parking brake inoperative on one side.
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 X?
Enter the reg to see its full MOT history, mileage records, write-off status, and finance checks.
Mercedes Benz X MOT FAQs
What are the most common MOT failures on a Mercedes Benz X?
Based on 46,332 DVSA MOT tests, the most common failure is anti-roll bar links worn — at 16x the national fleet average. Other frequent failures include emissions failure and light unit fault.
Is the Mercedes Benz X reliable based on MOT data?
The Mercedes Benz X has 7 categories where it fails more often than average. The main concern is anti-roll bar links worn. Always check a specific car's full history before buying.
What MOT failures should I expect at high mileage?
The most common high-mileage failures include anti-roll bar links worn, emissions failure, light unit fault.
How do I check a Mercedes Benz X'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.