BMW 420 MOT Pass Rate
86.8% of 29,002 BMW 420 MOT tests pass.
The 420 has a pass rate of 86.8%, a little higher than the average across all BMW models (84.8%).
The BMW 420 passes its MOT 86.8% of the time — well above the national average for cars, which sits at 78.3%.
Pass rate by vehicle age
Pass rate eases gradually with age, from 90.1% at 3–6 years to 82.8% at 10–15 years.
| Vehicle age | Pass rate | Tests | Average mileage |
|---|---|---|---|
| 0–3 years | no tests recorded | 0 | no reading |
| 3–6 years | 90.1% | 5,360 | 44,404 miles |
| 6–10 years | 86.7% | 20,034 | 74,633 miles |
| 10–15 years | 82.8% | 3,608 | 93,701 miles |
| 15+ years | no tests recorded | 0 | no reading |
Common MOT failure reasons for the BMW 420
The most common reason the BMW 420 fails its MOT is tyres — present in 53.3% of failed tests, most often logged as "tread depth below requirements of 1.6mm".
| Category | Share of failed tests | Example |
|---|---|---|
| Tyres | 53.3% | tread depth below requirements of 1.6mm |
| Lamps, reflectors and electrical equipment | 20.5% | not working |
| Brakes | 17.2% | less than 1.5 mm thick |
| Suspension | 15.1% | has a serious fluid leak |
| Visibility | 10.4% | provides insufficient washer liquid |
| Road Wheels | 7.2% | fixing missing |
| Identification of the vehicle | 4.0% | does not conform to the specified requirements |
| Noise, emissions and leaks | 3.2% | inoperative or indicates a malfunction |
| Body, chassis, structure | 1.6% | constant velocity boot split or insecure, no longer prevents the ingress of dirt |
| Steering | 1.3% | has excessive play |