2003 Mazda 323 — MOT failures & pass rate
The 2003 Mazda 323 passed 68.1% of its 2,016 recorded MOT tests. That is 4.3 percentage points worse than all cars of a similar age, which fail at 27.7%. Failures cluster in suspension, brakes and lighting & signalling.
What the MOT record shows
One area stands out: suspension, recorded in 18.4% of tests against 13.1% for the next-worst category.
At component level the recurring items are component mounting prescribed areas, prescribed areas and integral vehicle structure condition — component mounting prescribed areas alone was recorded 498 times.
Mileage is the strongest signal on the record: 13.7% of 0-30k cars fail, rising to 35.0% once past 120-150k — 2.6× the risk.
Suspension is the most common advisory, noted on 37.4% of tests — work that passed today but is likely due soon.
The trend is improving — the fail rate fell from 32.4% in 2021 to 27.0% in 2025, as the worst-kept examples leave the fleet.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Suspension | 18.4% | 372 |
| 2 | Brakes | 13.1% | 264 |
| 3 | Lighting & signalling | 11.4% | 229 |
| 4 | Body, structure & corrosion | 8.4% | 169 |
| 5 | Visibility | 5.7% | 114 |
| 6 | Emissions & environmental | 5.1% | 102 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Component mounting prescribed areas | 498 |
| 2 | Prescribed areas | 135 |
| 3 | Integral vehicle structure condition | 129 |
| 4 | Service brake performance | 106 |
| 5 | Chassis condition | 104 |
| 6 | Headlamp aim | 102 |
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 | 37.4% | 754 |
| 2 | Brakes | 30.0% | 604 |
| 3 | Tyres | 27.2% | 549 |
| 4 | Body, structure & corrosion | 17.8% | 359 |
| 5 | Emissions & environmental | 16.1% | 324 |
| 6 | Other defects | 12.7% | 255 |
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 | 95 | 13.7% |
| 30-60k | 569 | 29.7% |
| 60-90k | 790 | 32.7% |
| 90-120k | 447 | 36.7% |
| 120-150k | 97 | 35.0% |
Failure rate by age
By fuel type
| Fuel | Tests | Fail rate |
|---|---|---|
| Petrol | 1,934 | 31.6% |
| Diesel | 82 | 39.0% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 635 | 32.4% |
| 2022 | 493 | 33.1% |
| 2023 | 379 | 33.3% |
| 2024 | 298 | 30.9% |
| 2025 | 211 | 27.0% |
What to check before buying a 2003 323
The failure pattern for this year is specific enough to inspect against: suspension accounted for 18.4% of tests. Start there.
- Suspension (18.4% 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.
- Brakes (13.1% 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.
- Lighting & signalling (11.4% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£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 2003 Mazda 323s pass their MOT?
68.1% of the 2,016 2003 Mazda 323 MOT tests in this dataset passed — a 31.9% fail rate.
What is the most common MOT failure on a 2003 Mazda 323?
Suspension, recorded in 18.4% of tests, followed by brakes (13.1%).
Does the 2003 323 get worse with mileage?
Its MOT fail rate rises from 13.7% in the 0-30k band to 35.0% in the 120-150k band.
Methodology & source. Based on 2,016 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.