Mercedes-Benz 420 MOT data by year
The Mercedes-Benz 420 appears in 3,356 MOT tests in this dataset across model years 1980–2020. Its most common failure areas are lighting & signalling, brakes and suspension, and its overall pass rate is 84.3%.
3,356
MOT tests analysed
84.3%
Pass rate
15.7%
Fail rate
1980–2020
Years covered
By model year
| Year | Tests | Pass rate | Fail rate | Most common failure |
|---|---|---|---|---|
| 1987 | 868 | 84.5% | 15.6% | Lighting & signalling |
Most common failures (all years)
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 9.0% | 302 |
| 2 | Brakes | 5.7% | 192 |
| 3 | Suspension | 5.5% | 183 |
| 4 | Visibility | 4.4% | 149 |
| 5 | Body, structure & corrosion | 3.7% | 124 |
| 6 | Emissions & environmental | 3.3% | 110 |
| 7 | Tyres | 1.8% | 59 |
| 8 | Steering | 1.1% | 38 |
Methodology & source. Based on 3,356 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.