2021 Bmw M340D Mhev Auto — MOT failures & pass rate
Across 3,222 MOT tests analysed for the 2021 Bmw M340D Mhev Auto, the most common recorded failure areas were tyres, lighting & signalling and emissions & environmental. Its pass rate of 90.1% was below the average for cars of a similar age (91.3%). Higher-mileage examples failed more often — 13.1% in the 60-90k group versus 8.1% in the 0-30k group.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Tyres | 7.1% | 229 |
| 2 | Lighting & signalling | 1.4% | 46 |
| 3 | Emissions & environmental | 1.1% | 35 |
| 4 | Visibility | 0.9% | 30 |
| 5 | Suspension | 0.6% | 18 |
| 6 | Brakes | 0.4% | 13 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Tread depth | 55 |
| 2 | Headlamp aim | 51 |
| 3 | Malfunction indicator lamp | 28 |
| 4 | Registration plates | 22 |
| 5 | Washers | 18 |
| 6 | Wipers | 16 |
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 | 12.8% | 413 |
| 2 | Other defects | 3.9% | 125 |
| 3 | Emissions & environmental | 3.7% | 118 |
| 4 | Brakes | 2.5% | 80 |
| 5 | Visibility | 2.2% | 70 |
| 6 | Suspension | 1.3% | 41 |
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 | 862 | 8.1% |
| 30-60k | 2,051 | 10.1% |
| 60-90k | 282 | 13.1% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2023 | 87 | 3.5% |
| 2024 | 1,613 | 10.2% |
| 2025 | 1,522 | 9.9% |
What to check before buying a 2021 M340D Mhev Auto
Before buying a 2021 Bmw M340D Mhev Auto, focus on the areas it most often fails on. Tyres accounted for 7.1% of tests for this year.
- Tyres (7.1% 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.
- Emissions & environmental (1.1% of tests): More common on older diesels (DPF/EGR) — can be expensive; check for warning lights and smoke. Typical repair: £100–£600.
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 M340D Mhev Autos pass their MOT?
90.1% of the 3,222 2021 Bmw M340D Mhev Auto MOT tests in this dataset passed — a 9.9% fail rate.
What is the most common MOT failure on a 2021 Bmw M340D Mhev Auto?
Tyres, recorded in 7.1% of tests, followed by lighting & signalling (1.4%).
Does the 2021 M340D Mhev Auto get worse with mileage?
Its MOT fail rate rises from 8.1% in the 0-30k band to 13.1% in the 60-90k band.
Methodology & source. Based on 3,222 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.