1,242 tests in 2025
Mercedes-Benz Gt reliability and MOT pass rate
93% passed first time. The 7% fail rate is 15.6 points better than the all-car average, on a median example 8 years old with 23,090 miles.
MOT pass rates / Mercedes-Benz
Pass rate
93%
22.6% of all cars failed; 7% of these did.
Fixed on the day
0.6%
Passed after a defect was put right during the visit.
Median at test
23,090 mi
8 years old.
Fail rate by age
| Age at test | Tests | Fail rate |
|---|---|---|
| 3-5 years | 81 | — |
| 6-9 years | 952 | 6.8% |
| 10-13 years | 209 | 8.1% |
| 14+ years | 0 | — |
What the Gt fails on
Share of failed tests with at least one fail item in each DVSA inspection section. A test can fail in several sections at once.
- Tyres50 dangerous57.5%
- Noise, emissions and leaks14.9%
- Identification of the vehicle9.2%
- Lamps, reflectors and electrical equipment8%
- Suspension4.6%
- Seat belts and supplementary restraint systems3.4%
- Brakes3 dangerous2.3%
- Road Wheels2 dangerous2.3%
Is the Gt getting worse?
The fail rate rose 1.7 points to 6.9% from 2022 to 2025 while the median one tested aged 3 years. Ageing alone would predict about 6.6 points, so it is holding up better than the fleet average for its age.
| Year | Tests | Median age | Fail rate | All cars | |
|---|---|---|---|---|---|
| 2022 | 1,292 | 5 | 5.2% | 22.5% | |
| 2023 | 1,321 | 6 | 6.7% | 22.8% | |
| 2024 | 1,166 | 7 | 6.2% | 23.2% | |
| 2025 | 1,240 | 8 | 6.9% | 22.6% |
Fail rate is first attempts at class 4 tests. Median age is the age of a typical Gt at its test that year, and it is the number to watch: across the whole fleet each extra year of age adds roughly 1.9 points to the fail rate, so a model whose age and fail rate rise together is simply getting older.
The exact defects that fail it
Every failure item DVSA recorded against a Gt in 2025, counted by how many tests each one appeared on.
- 1Condition: has ply or cords exposed19 tests
- 2Condition: has a cut in excess of the requirements deep enough to reach the ply or cords19 tests
- 3Tread depth: tread depth below requirements of 1.6mm15 tests
- 4Registration plates: does not conform to the specified requirements7 tests
- 5Catalyst emissions: Lambda reading after 2nd fast idle outside specified limits5 tests
- 6Malfunction indicator lamp: inoperative or indicates a malfunction4 tests
- 7Catalyst emissions: carbon monoxide content after 2nd fast idle exceeds manufacturer's specified limits4 tests
- 8Catalyst emissions: carbon monoxide content at idle exceeds manufacturer's specified limits3 tests
What wears out first
Advisories are the tester flagging wear that is still legal. A typical Gt collects 2.05 of them per test, and these are the ones that come up most. Treat it as the running-repairs list for the next year or two.
- 1Tread depth: tread depth below requirements of 1.6mm122 tests
- 2Condition: has a tear, caused by separation or partial failure of its structure51 tests
- 3Non-component advisories: Nail in tyre29 tests
- 4Brake pads: less than 1.5 mm thick21 tests
- 5Tread depth: tread pattern not visible over the whole tread area when minimum depth required is 1.0mm16 tests
- 6Condition: has a cut in excess of the requirements deep enough to reach the ply or cords12 tests
- 7Condition: badly distorted10 tests
- 8Brake discs: in such a condition that it is seriously weakened8 tests
Questions
What is the Mercedes-Benz Gt MOT pass rate?
93% of the 1,242 Mercedes-Benz Gt first-attempt MOTs in 2025 passed. The fail rate of 7% compares with 22.6% across all cars. A further 0.6% passed after a defect was fixed during the test visit.
What does a Mercedes-Benz Gt usually fail on?
The single most common failure is "Condition: has ply or cords exposed", recorded on 19 failed tests, followed by "Condition: has a cut in excess of the requirements deep enough to reach the ply or cords" and "Tread depth: tread depth below requirements of 1.6mm". By section, tyres appears in 57.5% of failures, noise, emissions and leaks appears in 14.9% of failures, identification of the vehicle appears in 9.2% of failures.
Does age change the odds?
Sharply. At 3 to 5 years old the fail rate was 6.2%; at 10-13 years it was 8.1%. The median Mercedes-Benz Gt tested in 2025 was 8 years old with 23,090 miles.
Is the Mercedes-Benz Gt getting less reliable?
The fail rate rose 1.7 points to 6.9% from 2022 to 2025 while the median one tested aged 3 years. Ageing alone would predict about 6.6 points, so it is holding up better than the fleet average for its age.
First-attempt class 4 tests, 2025, from DVSA’s anonymised MOT data (OGL v3, retrieved 2026-09-12). DVSA records newer cars trim by trim; this page adds every Gt trim together. Year-on-year figures come from the same DVSA extracts for 2026 and earlier years. Full method on the pass rates hub.
Other Mercedes-Benz models
Checking a particular Gt?
The odds above are the model. The car in front of you has its own record: every test, every advisory, the mileage at each one.
Due a test? Find an approved MOT station near you.