1999 Mazda MX-5 — MOT failures & pass rate
The 1999 Mazda MX-5 passed 74.3% of its 18,665 recorded MOT tests. Coupes & convertibles of a similar age fail 22.1% of the time, so this is 3.7pp worse than the group it competes with. Failures cluster in lighting & signalling, brakes and emissions & environmental.
What the MOT record shows
No single area dominates — lighting & signalling (12.3%) and brakes (11.0%) are close, so failures are spread across several systems rather than one weak point.
At component level the recurring items are catalyst emissions, headlamp and headlamp aim — catalyst emissions alone was recorded 2,488 times.
Condition tracks the odometer closely. Failures run at 11.6% in the 0-30k band and 28.9% in the 150k+ band, a 17.3-point spread — more than double.
Brakes is the most common advisory, noted on 29.3% of tests — work that passed today but is likely due soon.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 12.3% | 2,288 |
| 2 | Brakes | 11.0% | 2,055 |
| 3 | Emissions & environmental | 10.7% | 1,996 |
| 4 | Suspension | 8.3% | 1,554 |
| 5 | Body, structure & corrosion | 4.7% | 884 |
| 6 | Visibility | 3.9% | 731 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Catalyst emissions | 2,488 |
| 2 | Headlamp | 996 |
| 3 | Headlamp aim | 981 |
| 4 | Prescribed areas | 939 |
| 5 | Service brake performance | 803 |
| 6 | Component mounting prescribed areas | 760 |
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 | 29.3% | 5,471 |
| 2 | Suspension | 27.1% | 5,063 |
| 3 | Tyres | 15.8% | 2,954 |
| 4 | Body, structure & corrosion | 14.2% | 2,649 |
| 5 | Emissions & environmental | 13.3% | 2,487 |
| 6 | Lighting & signalling | 9.9% | 1,852 |
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 | 613 | 11.6% |
| 30-60k | 2,542 | 18.0% |
| 60-90k | 5,723 | 25.0% |
| 90-120k | 5,240 | 28.5% |
| 120-150k | 2,778 | 30.1% |
| 150k+ | 1,759 | 28.9% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 4,491 | 25.7% |
| 2022 | 4,215 | 26.1% |
| 2023 | 3,824 | 25.3% |
| 2024 | 3,206 | 26.0% |
| 2025 | 2,929 | 25.5% |
What to check before buying a 1999 MX-5
The failure pattern for this year is specific enough to inspect against: lighting & signalling accounted for 12.3% of tests. Start there.
- Lighting & signalling (12.3% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Brakes (11.0% 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.
- Emissions & environmental (10.7% of tests): More common on older diesels (DPF/EGR) — can be expensive; check for warning lights and smoke. Typical repair: £100–£600.
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 1999 Mazda MX-5s pass their MOT?
74.3% of the 18,665 1999 Mazda MX-5 MOT tests in this dataset passed — a 25.7% fail rate.
What is the most common MOT failure on a 1999 Mazda MX-5?
Lighting & signalling, recorded in 12.3% of tests, followed by brakes (11.0%).
Does the 1999 MX-5 get worse with mileage?
Its MOT fail rate rises from 11.6% in the 0-30k band to 28.9% in the 150k+ band.
Methodology & source. Based on 18,665 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.