Mercedes-Benz Gl-Class MOT pass rate and common failures
In 2025, 81.9% of Mercedes-Benz Gl-Class MOT tests were a first-time pass, across 3,455 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
–
Too few tests at this age to say.
At 6–10 years
84.8%
All cars: 76.1% (8.7 points better). 1,145 tests.
At 11 years and over
80.2%
All cars: 61.3% (18.9 points better). 2,126 tests.
Pass rate by age
Figures by age, with typical mileage
| Age (years) | Tests | First-time pass | All cars | Typical mileage |
|---|---|---|---|---|
| 8 | 70 | 82.9% | 76.3% | 76,250 miles |
| 9 | 524 | 86.5% | 73.1% | 83,750 miles |
| 10 | 551 | 83.5% | 70.0% | 88,750 miles |
| 11 | 560 | 85.2% | 66.9% | 101,250 miles |
| 12 | 223 | 83.0% | 64.4% | 108,750 miles |
| 13 | 221 | 79.6% | 62.1% | 118,750 miles |
| 14 | 221 | 79.2% | 60.2% | 121,250 miles |
| 15 | 152 | 78.3% | 58.6% | 126,250 miles |
| 16 | 159 | 75.5% | 57.5% | 126,250 miles |
| 17 | 389 | 75.8% | 57.2% | 131,250 miles |
| 18 | 201 | 78.6% | 57.0% | 133,750 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 Gl-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 | Gl-Class | All cars |
|---|---|---|
| Tyres | 8.1% | 8.4% |
| Brakes | 7.3% | 10.2% |
| Lamps, reflectors and electrical equipment | 7.2% | 16.6% |
| Noise, emissions and leaks | 3.4% | 4.0% |
| Suspension | 3.4% | 13.7% |
| Visibility | 2.3% | 5.2% |
| Body, chassis, structure | 2.1% | 4.2% |
| Seat belts and supplementary restraint systems | 1.2% | 1.1% |
Most common reasons for failing
- Tread depth below requirements of 1.6mm failed 3.2% of tests
- Rigid brake pipes: excessively corroded failed 2.1% of tests · what this means
- Malfunction indicator lamp: inoperative or indicates a malfunction failed 2.1% of tests · what this means
- Condition: has ply or cords exposed failed 1.9% of tests
- Condition: has a cut in excess of the requirements deep enough to reach the ply or cords failed 1.6% of tests
- Position lamp: not working failed 1.6% of tests · what this means
- Joints: constant velocity boot split or insecure, no longer prevents the ingress of dirt failed 1.4% of tests
- Shock absorbers: has a serious fluid leak failed 1.0% of tests · what this means
- Brake pads: less than 1.5 mm thick failed 1.0% of tests · what this means
- Wipers: does not clear the windscreen effectively failed 0.9% of tests · what this means
Checking a particular Gl-Class?
See its own MOT history, mileage record and advisories in plain English. Free, no sign-up.
About these figures
- They cover every Gl-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 87.2%, petrol 12.5%, electric diesel 0.2%.
- 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.