2021 Mazda Cx-30 -L Lux Mhev — MOT failures & pass rate
Across 3,055 MOT tests analysed for the 2021 Mazda Cx-30 -L Lux Mhev, the most common recorded failure areas were tyres, visibility and brakes. Its pass rate of 94.1% 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 | 3.6% | 109 |
| 2 | Visibility | 2.3% | 70 |
| 3 | Brakes | 1.4% | 43 |
| 4 | Lighting & signalling | 1.1% | 34 |
| 5 | Emissions & environmental | 0.6% | 17 |
| 6 | Suspension | 0.6% | 17 |
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 | 108 |
| 2 | Headlamp aim | 46 |
| 3 | Washers | 46 |
| 4 | Wipers | 36 |
| 5 | Brake pads | 35 |
| 6 | Shock absorbers | 23 |
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 | 19.9% | 607 |
| 2 | Brakes | 19.7% | 601 |
| 3 | Suspension | 9.6% | 293 |
| 4 | Other defects | 5.1% | 157 |
| 5 | Visibility | 2.5% | 78 |
| 6 | Lighting & signalling | 0.2% | 6 |
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 | 1,985 | 4.1% |
| 30-60k | 1,013 | 9.3% |
| 60-90k | 47 | 8.5% |
Failure rate by age
By fuel type
| Fuel | Tests | Fail rate |
|---|---|---|
| Petrol | 3,023 | 5.9% |
| Hybrid | 32 | 3.1% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2024 | 1,505 | 6.2% |
| 2025 | 1,522 | 5.8% |
What to check before buying a 2021 Cx-30 -L Lux Mhev
Before buying a 2021 Mazda Cx-30 -L Lux Mhev, focus on the areas it most often fails on. Tyres accounted for 3.6% of tests for this year.
- Tyres (3.6% 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 (2.3% 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 (1.4% 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 -L Lux Mhevs pass their MOT?
94.1% of the 3,055 2021 Mazda Cx-30 -L Lux Mhev MOT tests in this dataset passed — a 5.9% fail rate.
What is the most common MOT failure on a 2021 Mazda Cx-30 -L Lux Mhev?
Tyres, recorded in 3.6% of tests, followed by visibility (2.3%).
Does the 2021 Cx-30 -L Lux Mhev get worse with mileage?
Its MOT fail rate rises from 4.1% in the 0-30k band to 8.5% in the 60-90k band.
Methodology & source. Based on 3,055 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.