2021 Bmw M340I Mhev Auto — MOT failures & pass rate
Across 4,080 MOT tests analysed for the 2021 Bmw M340I Mhev Auto, the most common recorded failure areas were tyres, lighting & signalling and visibility. Its pass rate of 91.3% was in line with the average for cars of a similar age (91.3%).
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Tyres | 7.2% | 294 |
| 2 | Lighting & signalling | 1.4% | 55 |
| 3 | Visibility | 0.4% | 18 |
| 4 | Road wheels | 0.4% | 16 |
| 5 | Suspension | 0.4% | 15 |
| 6 | Steering | 0.4% | 15 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Headlamp aim | 63 |
| 2 | Tread depth | 44 |
| 3 | Registration plates | 17 |
| 4 | Ball joint | 14 |
| 5 | Track rod end | 14 |
| 6 | Side repeaters | 10 |
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 | 12.3% | 501 |
| 2 | Other defects | 4.3% | 175 |
| 3 | Visibility | 2.2% | 91 |
| 4 | Brakes | 1.6% | 67 |
| 5 | Emissions & environmental | 1.3% | 52 |
| 6 | Suspension | 0.8% | 34 |
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 | 1,865 | 8.4% |
| 30-60k | 2,073 | 8.8% |
| 60-90k | 136 | 12.5% |
Failure rate by age
By fuel type
| Fuel | Tests | Fail rate |
|---|---|---|
| Hybrid | 4,006 | 8.7% |
| Petrol | 74 | 12.2% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2023 | 116 | 6.0% |
| 2024 | 2,040 | 9.5% |
| 2025 | 1,923 | 8.0% |
What to check before buying a 2021 M340I Mhev Auto
Before buying a 2021 Bmw M340I Mhev Auto, focus on the areas it most often fails on. Tyres accounted for 7.2% of tests for this year.
- Tyres (7.2% 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.
- Lighting & signalling (1.4% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Visibility (0.4% of tests): Wipers, washers, mirrors and screen damage — usually inexpensive, but check for chips in the driver's line of sight. Typical repair: £15–£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 2021 Bmw M340I Mhev Autos pass their MOT?
91.3% of the 4,080 2021 Bmw M340I Mhev Auto MOT tests in this dataset passed — a 8.7% fail rate.
What is the most common MOT failure on a 2021 Bmw M340I Mhev Auto?
Tyres, recorded in 7.2% of tests, followed by lighting & signalling (1.4%).
Does the 2021 M340I Mhev Auto get worse with mileage?
Its MOT fail rate rises from 8.4% in the 0-30k band to 12.5% in the 60-90k band.
Methodology & source. Based on 4,080 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.