2021 Mazda Cx-30 Gt Mhev — MOT failures & pass rate
Across 3,426 MOT tests analysed for the 2021 Mazda Cx-30 Gt Mhev, the most common recorded failure areas were tyres, visibility and brakes. Its pass rate of 94.5% 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 | 2.4% | 82 |
| 2 | Visibility | 2.2% | 75 |
| 3 | Brakes | 1.7% | 57 |
| 4 | Lighting & signalling | 0.9% | 32 |
| 5 | Emissions & environmental | 0.5% | 18 |
| 6 | Suspension | 0.3% | 11 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Wipers | 67 |
| 2 | Brake pads | 47 |
| 3 | Headlamp aim | 39 |
| 4 | Washers | 29 |
| 5 | Tread depth | 24 |
| 6 | Shock absorbers | 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 | Brakes | 20.7% | 709 |
| 2 | Tyres | 17.8% | 611 |
| 3 | Suspension | 7.9% | 272 |
| 4 | Other defects | 4.9% | 169 |
| 5 | Visibility | 2.7% | 93 |
| 6 | Lighting & signalling | 0.1% | 5 |
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 | 2,326 | 4.3% |
| 30-60k | 1,052 | 8.1% |
| 60-90k | 46 | 6.5% |
Failure rate by age
By fuel type
| Fuel | Tests | Fail rate |
|---|---|---|
| Petrol | 3,383 | 5.6% |
| Hybrid | 43 | 0.0% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2023 | 35 | 8.6% |
| 2024 | 1,677 | 5.3% |
| 2025 | 1,714 | 5.7% |
What to check before buying a 2021 Cx-30 Gt Mhev
Before buying a 2021 Mazda Cx-30 Gt Mhev, focus on the areas it most often fails on. Tyres accounted for 2.4% of tests for this year.
- Tyres (2.4% 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.
- Visibility (2.2% 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.
- Brakes (1.7% 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.
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 Gt Mhevs pass their MOT?
94.5% of the 3,426 2021 Mazda Cx-30 Gt Mhev MOT tests in this dataset passed — a 5.5% fail rate.
What is the most common MOT failure on a 2021 Mazda Cx-30 Gt Mhev?
Tyres, recorded in 2.4% of tests, followed by visibility (2.2%).
Does the 2021 Cx-30 Gt Mhev get worse with mileage?
Its MOT fail rate rises from 4.3% in the 0-30k band to 6.5% in the 60-90k band.
Methodology & source. Based on 3,426 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.