2020 Mazda Cx 30 — MOT failures & pass rate
Across 3,742 MOT tests analysed for the 2020 Mazda Cx 30, the most common recorded failure areas were visibility, tyres and brakes. Its pass rate of 93.5% was above the average for cars of a similar age (90.5%). Higher-mileage examples failed more often — 10.8% in the 60-90k group versus 5.0% in the 0-30k group.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Visibility | 3.1% | 116 |
| 2 | Tyres | 3.0% | 111 |
| 3 | Brakes | 1.6% | 60 |
| 4 | Lighting & signalling | 1.0% | 37 |
| 5 | Suspension | 0.8% | 30 |
| 6 | Emissions & environmental | 0.5% | 19 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Wipers | 106 |
| 2 | Brake pads | 46 |
| 3 | Headlamp aim | 43 |
| 4 | Tread depth | 38 |
| 5 | Washers | 29 |
| 6 | Shock absorbers | 19 |
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 | 21.6% | 808 |
| 2 | Tyres | 18.4% | 687 |
| 3 | Suspension | 6.7% | 251 |
| 4 | Other defects | 5.1% | 191 |
| 5 | Visibility | 3.0% | 114 |
| 6 | Body, structure & corrosion | 0.3% | 12 |
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 | 2,370 | 5.0% |
| 30-60k | 1,272 | 9.0% |
| 60-90k | 93 | 10.8% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2023 | 1,238 | 4.9% |
| 2024 | 1,232 | 6.9% |
| 2025 | 1,267 | 7.8% |
What to check before buying a 2020 Cx 30
Before buying a 2020 Mazda Cx 30, focus on the areas it most often fails on. Visibility accounted for 3.1% of tests for this year.
- Visibility (3.1% 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.
- Tyres (3.0% 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 (1.6% 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 30s pass their MOT?
93.5% of the 3,742 2020 Mazda Cx 30 MOT tests in this dataset passed — a 6.5% fail rate.
What is the most common MOT failure on a 2020 Mazda Cx 30?
Visibility, recorded in 3.1% of tests, followed by tyres (3.0%).
Does the 2020 Cx 30 get worse with mileage?
Its MOT fail rate rises from 5.0% in the 0-30k band to 10.8% in the 60-90k band.
Methodology & source. Based on 3,742 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.