2021 Mazda Cx-30 -L Mhev — MOT failures & pass rate
Across 1,175 MOT tests analysed for the 2021 Mazda Cx-30 -L Mhev, the most common recorded failure areas were tyres, brakes and visibility. Its pass rate of 92.9% was above the average for cars of a similar age (91.2%).
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Tyres | 3.7% | 44 |
| 2 | Brakes | 2.2% | 26 |
| 3 | Visibility | 2.0% | 24 |
| 4 | Lighting & signalling | 0.7% | 8 |
| 5 | Emissions & environmental | 0.7% | 8 |
| 6 | Suspension | 0.5% | 6 |
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 | 48 |
| 2 | Brake pads | 26 |
| 3 | Washers | 15 |
| 4 | Wipers | 14 |
| 5 | Headlamp aim | 11 |
| 6 | Shock absorbers | 9 |
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 | 22.8% | 268 |
| 2 | Brakes | 20.9% | 246 |
| 3 | Suspension | 8.5% | 100 |
| 4 | Other defects | 5.3% | 62 |
| 5 | Visibility | 2.8% | 33 |
| 6 | Seat belts & restraints | 0.3% | 4 |
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 | 761 | 5.0% |
| 30-60k | 394 | 10.4% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2024 | 585 | 7.7% |
| 2025 | 577 | 6.6% |
What to check before buying a 2021 Cx-30 -L Mhev
Before buying a 2021 Mazda Cx-30 -L Mhev, focus on the areas it most often fails on. Tyres accounted for 3.7% of tests for this year.
- Tyres (3.7% 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.
- Brakes (2.2% of tests): Pads/discs are routine wear; binding, imbalance or corroded pipes are more serious — test for pulling under braking. Typical repair: £100–£350 per axle.
- Visibility (2.0% 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 Mazda Cx-30 -L Mhevs pass their MOT?
92.9% of the 1,175 2021 Mazda Cx-30 -L Mhev MOT tests in this dataset passed — a 7.1% fail rate.
What is the most common MOT failure on a 2021 Mazda Cx-30 -L Mhev?
Tyres, recorded in 3.7% of tests, followed by brakes (2.2%).
Does the 2021 Cx-30 -L Mhev get worse with mileage?
Its MOT fail rate rises from 5.0% in the 0-30k band to 10.4% in the 30-60k band.
Methodology & source. Based on 1,175 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.