Mercedes-Benz Slc-Class MOT pass rate and common failures
In 2025, 85.1% of Mercedes-Benz Slc-Class MOT tests were a first-time pass, across 8,983 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
89.1%
All cars: 86.1% (3 points better). 1,446 tests.
At 6–10 years
84.4%
All cars: 76.1% (8.3 points better). 7,529 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 |
|---|---|---|---|---|
| 3 | 125 | 92.0% | 87.8% | 13,750 miles |
| 4 | 537 | 88.6% | 86.4% | 18,750 miles |
| 5 | 784 | 89.0% | 84.5% | 21,250 miles |
| 6 | 1,286 | 89.5% | 81.9% | 26,250 miles |
| 7 | 2,487 | 84.0% | 79.3% | 33,750 miles |
| 8 | 3,119 | 82.6% | 76.3% | 38,750 miles |
| 9 | 637 | 84.0% | 73.1% | 43,750 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 Slc-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 | Slc-Class | All cars |
|---|---|---|
| Tyres | 9.2% | 8.4% |
| Suspension | 6.1% | 13.7% |
| Lamps, reflectors and electrical equipment | 2.4% | 16.6% |
| Brakes | 2.1% | 10.2% |
| Noise, emissions and leaks | 1.5% | 4.0% |
| Road wheels | 0.8% | 0.5% |
| Visibility | 0.7% | 5.2% |
| Identification of the vehicle | 0.6% | 0.4% |
Most common reasons for failing
- Condition: has ply or cords exposed failed 3.0% of tests
- Condition: has a cut in excess of the requirements deep enough to reach the ply or cords failed 2.3% of tests
- Coil spring: fractured or broken failed 2.1% of tests · what this means
- Tread depth below requirements of 1.6mm failed 1.8% of tests
- Ball joint excessively worn failed 1.5% of tests · what this means
- Ball joint dust cover no longer prevents the ingress of dirt failed 1.2% of tests · what this means
- Malfunction indicator lamp: inoperative or indicates a malfunction failed 1.0% of tests · what this means
- Condition: has a tear, caused by separation or partial failure of its structure failed 0.8% of tests
- Anti-lock braking system: warning lamp indicates an abs fault failed 0.7% of tests
- Linkage ball joint dust cover: ball joint dust cover no longer prevents the ingress of dirt failed 0.7% of tests · what this means
Checking a particular Slc-Class?
See its own MOT history, mileage record and advisories in plain English. Free, no sign-up.
About these figures
- They cover every Slc-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: petrol 68.9%, diesel 31.1%.
- 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.