Mercedes-Benz X-Class MOT pass rate and common failures
In 2025, 81.1% of Mercedes-Benz X-Class MOT tests were a first-time pass, across 3,695 tests in Great Britain. For all cars it was 71.5%.
Compared with cars of the same age
Older cars fail more often, so a model that’s mostly a few years old will look better than one that’s mostly 12. These figures compare like with like.
At 3–5 years
82.9%
All cars: 86.1% (3.2 points worse). 1,474 tests.
At 6–10 years
79.9%
All cars: 76.1% (3.8 points better). 2,208 tests.
At 11 years and over
–
Too few tests at this age to say.
Pass rate by age
Figures by age, with typical mileage
| Age (years) | Tests | First-time pass | All cars | Typical mileage |
|---|---|---|---|---|
| 4 | 309 | 86.1% | 86.4% | 48,750 miles |
| 5 | 1,165 | 82.1% | 84.5% | 56,250 miles |
| 6 | 1,586 | 80.9% | 81.9% | 66,250 miles |
| 7 | 622 | 77.5% | 79.3% | 78,750 miles |
Typical mileage is the median reading at the test, to the nearest 2,500 miles.
What fails most often
The share of Mercedes-Benz X-Class MOT tests that failed on at least one item in each area, against all cars. A test can fail on several areas at once.
| Area | X-Class | All cars |
|---|---|---|
| Lamps, reflectors and electrical equipment | 6.8% | 16.6% |
| Brakes | 6.8% | 10.2% |
| Tyres | 5.7% | 8.4% |
| Noise, emissions and leaks | 4.4% | 4.0% |
| Visibility | 3.6% | 5.2% |
| Seat belts and supplementary restraint systems | 3.4% | 1.1% |
| Suspension | 2.4% | 13.7% |
| Body, chassis, structure | 1.9% | 4.2% |
Most common reasons for failing
- Malfunction indicator lamp: inoperative or indicates a malfunction failed 3.9% of tests · what this means
- Srs malfunction indicator lamp: warning lamp indicates a fault failed 2.7% of tests · what this means
- Brake pads: less than 1.5 mm thick failed 2.3% of tests · what this means
- Wipers: does not clear the windscreen effectively failed 2.2% of tests · what this means
- Tread depth below requirements of 1.6mm failed 2.1% of tests
- Registration plate lamp(s): inoperative in the case of a single lamp or all lamps failed 1.4% of tests · what this means
- Condition: has a cut in excess of the requirements deep enough to reach the ply or cords failed 1.3% of tests
- Tyre pressure monitoring system: malfunctioning or obviously inoperative failed 1.2% of tests
- Rbt (sp): efficiency below requirements failed 1.2% of tests
- Door condition: cannot be opened from inside the vehicle failed 0.9% of tests
Checking a particular X-Class?
See its own MOT history, mileage record and advisories in plain English. Free, no sign-up.
About these figures
- They cover every X-Class version DVSA records under this name (engines, trims and generations together), on its first MOT test of each visit. A “pass with rectification” (fixed within an hour) counts as a fail, as in DVSA’s own statistics.
- Cars under three years old are left out, because the few tested that young are mostly taxis.
- Fuel mix of the cars tested: diesel 100.0%.
- A pass rate describes the model, not any one car. How a car has been looked after matters more.
Download these figures (CSV) · Other Mercedes-Benz models · All makes
Source: DVSA anonymised MOT test data for 2025. Contains public sector information licensed under the Open Government Licence v3.0. Our own analysis; not produced or endorsed by DVSA.