2012 Mazda 3 — MOT failures & pass rate
The 2012 Mazda 3 passed 79.5% of its 31,169 recorded MOT tests. Small family cars of a similar age fail at 21.3%, so the 2012 3 sits squarely on the average. Failures cluster in suspension, lighting & signalling and tyres.
What the MOT record shows
No single area dominates — suspension (10.2%) and lighting & signalling (9.0%) are close, so failures are spread across several systems rather than one weak point.
At component level the recurring items are ball joint, position lamp and tread depth — ball joint alone was recorded 2,177 times.
A 150k+ example is materially riskier than a 0-30k one: 28.5% versus 7.7%.
Split by fuel, diesel examples fail 3.7pp more often than petrol ones (22.8% vs 19.2%) — worth weighing if you have a choice.
Advisories point at the next bill rather than this one: suspension was flagged on 33.8% of tests without failing them.
The trend is worsening — 16.8% of tests failed in 2021 against 23.4% in 2025, the usual pattern as a fleet ages.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Suspension | 10.2% | 3,179 |
| 2 | Lighting & signalling | 9.0% | 2,806 |
| 3 | Tyres | 6.3% | 1,966 |
| 4 | Brakes | 4.8% | 1,484 |
| 5 | Visibility | 4.1% | 1,274 |
| 6 | Emissions & environmental | 2.0% | 631 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Ball joint | 2,177 |
| 2 | Position lamp | 1,358 |
| 3 | Tread depth | 1,141 |
| 4 | Headlamp aim | 856 |
| 5 | Brake pads | 830 |
| 6 | Washers | 809 |
Top advisory categories
Advisories aren't failures, but they flag work likely needed soon — useful when budgeting.
| # | Category | % of tests with advisory | Tests |
|---|---|---|---|
| 1 | Suspension | 33.8% | 10,535 |
| 2 | Tyres | 29.3% | 9,142 |
| 3 | Brakes | 22.1% | 6,873 |
| 4 | Other defects | 9.1% | 2,834 |
| 5 | Lighting & signalling | 9.0% | 2,798 |
| 6 | Emissions & environmental | 4.8% | 1,503 |
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 | 881 | 7.7% |
| 30-60k | 6,179 | 12.7% |
| 60-90k | 11,670 | 19.9% |
| 90-120k | 8,392 | 25.1% |
| 120-150k | 3,091 | 26.9% |
| 150k+ | 947 | 28.5% |
Failure rate by age
By fuel type
| Fuel | Tests | Fail rate |
|---|---|---|
| Petrol | 20,034 | 19.2% |
| Diesel | 11,135 | 22.8% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 6,241 | 16.8% |
| 2022 | 6,363 | 19.2% |
| 2023 | 6,390 | 21.0% |
| 2024 | 6,187 | 22.2% |
| 2025 | 5,988 | 23.4% |
What to check before buying a 2012 3
On a 2012 3, suspension is what the MOT record says goes wrong most — it appeared in 10.2% of tests. Check these areas before you commit.
- Suspension (10.2% of tests): Worn drop links, bushes, springs or shocks — listen for knocks over bumps and check for uneven tyre wear. Typical repair: £150–£450 per corner.
- Lighting & signalling (9.0% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Tyres (6.3% 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.
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 2012 Mazda 3s pass their MOT?
79.5% of the 31,169 2012 Mazda 3 MOT tests in this dataset passed — a 20.5% fail rate.
What is the most common MOT failure on a 2012 Mazda 3?
Suspension, recorded in 10.2% of tests, followed by lighting & signalling (9.0%).
Does the 2012 3 get worse with mileage?
Its MOT fail rate rises from 7.7% in the 0-30k band to 28.5% in the 150k+ band.
Methodology & source. Based on 31,169 MOT tests. Dataset: DVSA MOT testing data (2021,2022,2023,2024,2025). Data last updated 2026-07-27. Figures reflect MOT-testable defects only — read the methodology for how these are calculated and what they don't measure.