2021 Mazda Cx-30 -L Lux Mhev Auto — MOT failures & pass rate
Across 983 MOT tests analysed for the 2021 Mazda Cx-30 -L Lux Mhev Auto, the most common recorded failure areas were tyres, lighting & signalling and visibility. Its pass rate of 94.9% 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 | 2.8% | 27 |
| 2 | Lighting & signalling | 2.5% | 25 |
| 3 | Visibility | 1.5% | 15 |
| 4 | Brakes | 1.3% | 13 |
| 5 | Suspension | 0.5% | 5 |
| 6 | Other defects | 0.1% | 1 |
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 | 22 |
| 2 | Headlamp aim | 18 |
| 3 | Brake pads | 10 |
| 4 | Wipers | 10 |
| 5 | Washers | 7 |
| 6 | Shock absorbers | 6 |
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 | 16.1% | 158 |
| 2 | Brakes | 14.3% | 141 |
| 3 | Suspension | 10.8% | 106 |
| 4 | Other defects | 4.3% | 42 |
| 5 | Visibility | 2.3% | 23 |
| 6 | Lighting & signalling | 0.3% | 3 |
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 | 698 | 3.3% |
| 30-60k | 260 | 9.2% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2024 | 482 | 4.8% |
| 2025 | 495 | 5.5% |
What to check before buying a 2021 Cx-30 -L Lux Mhev Auto
Before buying a 2021 Mazda Cx-30 -L Lux Mhev Auto, focus on the areas it most often fails on. Tyres accounted for 2.8% of tests for this year.
- Tyres (2.8% 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 (2.5% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Visibility (1.5% 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 Lux Mhev Autos pass their MOT?
94.9% of the 983 2021 Mazda Cx-30 -L Lux Mhev Auto MOT tests in this dataset passed — a 5.1% fail rate.
What is the most common MOT failure on a 2021 Mazda Cx-30 -L Lux Mhev Auto?
Tyres, recorded in 2.8% of tests, followed by lighting & signalling (2.5%).
Does the 2021 Cx-30 -L Lux Mhev Auto get worse with mileage?
Its MOT fail rate rises from 3.3% in the 0-30k band to 9.2% in the 30-60k band.
Methodology & source. Based on 983 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.