Mercedes-Benz 300 MOT pass rate
81.3% of 7,450 Mercedes-Benz 300 MOT tests pass.
At 81.3%, the 300 passes slightly less often than the average across all Mercedes-Benz models (83.5%).
The Mercedes-Benz 300 has a pass rate of 81.3%, a little higher than the national average for cars (79.2%).
Own this Mercedes-Benz 300?
This is the average across every Mercedes-Benz 300 in the dataset. Look up your own registration for its actual MOT history, and a free place to keep its maintenance records.
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Pass rate by vehicle age
| Vehicle age | Pass rate | Tests | Average mileage |
|---|---|---|---|
| 0–3 years | too few tests (4) | 4 | no reading |
| 3–6 years | too few tests (19) | 19 | no reading |
| 6–10 years | too few tests (5) | 5 | no reading |
| 10–15 years | too few tests (26) | 26 | no reading |
| 15+ years | 81.3% | 7,396 | 114,608 miles |
Common MOT failure reasons for the Mercedes-Benz 300
The most common reason the Mercedes-Benz 300 fails its MOT is lamps, reflectors and electrical equipment — present in 63.1% of failed tests, most often logged as "Not working".
| Category | Share of failed tests | Example |
|---|---|---|
| Lamps, reflectors and electrical equipment | 63.1% | Not working |
| Brakes | 35.8% | Excessively binding |
| Suspension | 34.7% | Prescribed area excessively corroded significantly reducing structural strength |
| Body, chassis, structure | 23.6% | Has a major leak of exhaust gases |
| Visibility | 20.2% | Does not clear the windscreen effectively |
| Noise, emissions and leaks | 13.7% | Emissions carbon monoxide content excessive |
| Steering | 9.4% | Ball joint dust cover excessively damaged or deteriorated so that it no longer prevents the ingress of dirt |
| Tyres | 9.4% | Has ply or cords exposed |
| Seat belts and supplementary restraint systems | 4.4% | Prescribed area strength or continuity significantly reduced |
| Road Wheels | 1.3% | Fixing missing |
Related Mercedes-Benz models
- Mercedes-Benz X-Class — 88.2% pass rate
- Mercedes-Benz Viano — 74.6% pass rate
- Mercedes-Benz Eqa — 91.6% pass rate
- Mercedes-Benz GL — 87.0% pass rate
- Mercedes-Benz 190 — 77.5% pass rate
- Mercedes-Benz CL — 84.0% pass rate
Frequently asked questions
- What is the MOT pass rate for the Mercedes-Benz 300?
- 81.3% of Mercedes-Benz 300 MOT tests pass, based on 7,450 tests in the DVSA anonymised MOT tests and results dataset.
- What are the most common MOT failures for the Mercedes-Benz 300?
- The most common reason the Mercedes-Benz 300 fails its MOT is lamps, reflectors and electrical equipment — present in 63.1% of failed tests, most often logged as "Not working".
- Does this show the Mercedes-Benz 300's service history?
- No — this is MOT test data, which covers roadworthiness, not servicing. A service history is a separate record of maintenance work, which a specific car only has if its owner has kept it. See the Mercedes-Benz service history guide for how to check and keep one.