2020 Mazda Cx-30 -L Mhev — MOT failures & pass rate
Across 942 MOT tests analysed for the 2020 Mazda Cx-30 -L 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 (90.6%). Higher-mileage examples failed more often — 12.1% in the 60-90k group versus 4.1% in the 0-30k group.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Tyres | 3.3% | 31 |
| 2 | Visibility | 3.0% | 28 |
| 3 | Brakes | 2.2% | 21 |
| 4 | Emissions & environmental | 1.0% | 9 |
| 5 | Suspension | 1.0% | 9 |
| 6 | Lighting & signalling | 1.0% | 9 |
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 | 36 |
| 2 | Wipers | 18 |
| 3 | Brake pads | 17 |
| 4 | Washers | 12 |
| 5 | Shock absorbers | 10 |
| 6 | Brake discs | 10 |
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 | 20.6% | 194 |
| 2 | Brakes | 19.3% | 182 |
| 3 | Suspension | 6.3% | 59 |
| 4 | Other defects | 5.6% | 53 |
| 5 | Visibility | 2.3% | 22 |
| 6 | Seat belts & restraints | 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 | 562 | 4.1% |
| 30-60k | 342 | 8.2% |
| 60-90k | 33 | 12.1% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2023 | 310 | 4.5% |
| 2024 | 299 | 5.7% |
| 2025 | 316 | 7.3% |
What to check before buying a 2020 Cx-30 -L Mhev
Before buying a 2020 Mazda Cx-30 -L Mhev, focus on the areas it most often fails on. Tyres accounted for 3.3% of tests for this year.
- Tyres (3.3% 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 (3.0% 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.
- 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.
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 2020 Mazda Cx-30 -L Mhevs pass their MOT?
94.1% of the 942 2020 Mazda Cx-30 -L Mhev MOT tests in this dataset passed — a 5.9% fail rate.
What is the most common MOT failure on a 2020 Mazda Cx-30 -L Mhev?
Tyres, recorded in 3.3% of tests, followed by visibility (3.0%).
Does the 2020 Cx-30 -L Mhev get worse with mileage?
Its MOT fail rate rises from 4.1% in the 0-30k band to 12.1% in the 60-90k band.
Methodology & source. Based on 942 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.