2018 Mercedes-Benz Gt — MOT failures & pass rate
Across 1,562 MOT tests analysed for the 2018 Mercedes-Benz Gt, the most common recorded failure areas were tyres, other defects and lighting & signalling. Its pass rate of 95.3% was above the average for cars of a similar age (89.1%).
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Tyres | 2.5% | 39 |
| 2 | Other defects | 1.1% | 18 |
| 3 | Lighting & signalling | 0.8% | 12 |
| 4 | Emissions & environmental | 0.7% | 11 |
| 5 | Brakes | 0.3% | 4 |
| 6 | Visibility | 0.3% | 4 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Registration plates | 26 |
| 2 | Catalyst emissions | 10 |
| 3 | Headlamp aim | 10 |
| 4 | Tread depth | 7 |
| 5 | Wipers | 5 |
| 6 | Brake pads | 5 |
Top advisory categories
Advisories aren't failures, but they flag work likely needed soon — useful when budgeting.
| # | Category | % of tests with advisory | Tests |
|---|---|---|---|
| 1 | Tyres | 12.2% | 190 |
| 2 | Visibility | 2.4% | 37 |
| 3 | Other defects | 1.9% | 29 |
| 4 | Brakes | 0.8% | 13 |
| 5 | Road wheels | 0.7% | 11 |
| 6 | Lighting & signalling | 0.2% | 3 |
Failure rate by mileage
Higher-mileage cars tend to fail more — often the most useful guide to real condition.
| Mileage band | Tests | Fail rate |
|---|---|---|
| 0-30k | 1,409 | 4.3% |
| 30-60k | 151 | 8.6% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 320 | 4.4% |
| 2022 | 314 | 4.1% |
| 2023 | 317 | 6.0% |
| 2024 | 312 | 4.5% |
| 2025 | 299 | 4.7% |
What to check before buying a 2018 Gt
Before buying a 2018 Mercedes-Benz Gt, focus on the areas it most often fails on. Tyres accounted for 2.5% of tests for this year.
- Tyres (2.5% of tests): Usually a quick, known-cost fix, but check tread, age and uneven wear (which can hint at alignment or suspension issues). Typical repair: £50–£120 per tyre.
- Other defects (1.1% of tests): Miscellaneous items not in the main categories. Typical repair: varies.
- Lighting & signalling (0.8% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
Repair costs are rough UK ballpark ranges to set expectations, not quotes — actual prices vary widely by car, parts and garage.
Frequently asked questions
How many 2018 Mercedes-Benz Gts pass their MOT?
95.3% of the 1,562 2018 Mercedes-Benz Gt MOT tests in this dataset passed — a 4.7% fail rate.
What is the most common MOT failure on a 2018 Mercedes-Benz Gt?
Tyres, recorded in 2.5% of tests, followed by other defects (1.1%).
Does the 2018 Gt get worse with mileage?
Its MOT fail rate rises from 4.3% in the 0-30k band to 8.6% in the 30-60k band.
Methodology & source. Based on 1,562 MOT tests. Dataset: DVSA MOT testing data (2021,2022,2023,2024,2025). Data last updated 2026-07-01. Figures reflect MOT-testable defects only — read the methodology for how these are calculated and what they don't measure.