2003 SEAT Leon — MOT failures & pass rate
The 2003 SEAT Leon passed 74.2% of its 8,878 recorded MOT tests. Small family cars of a similar age fail 28.1% of the time, so this is 2.3pp better than the group it competes with. Failures cluster in lighting & signalling, brakes and suspension.
What the MOT record shows
One area stands out: lighting & signalling, recorded in 16.6% of tests against 9.9% for the next-worst category.
At component level the recurring items are headlamp aim, catalyst emissions and track rod end — headlamp aim alone was recorded 568 times.
Mileage matters less than usual here: the 2003 Leon fails 22.9% of the time in the 0-30k band and 26.1% at 150k+, a spread of only 3.2 points.
The petrol cars hold up better: 25.4% fail against 27.4% for diesel, a 1.9-point gap across 8,878 tests.
Brakes is the most common advisory, noted on 38.2% of tests — work that passed today but is likely due soon.
The trend is improving — the fail rate fell from 27.6% in 2021 to 23.4% in 2025, as the worst-kept examples leave the fleet.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 16.6% | 1,471 |
| 2 | Brakes | 9.9% | 878 |
| 3 | Suspension | 9.7% | 864 |
| 4 | Emissions & environmental | 8.7% | 773 |
| 5 | Body, structure & corrosion | 8.1% | 720 |
| 6 | Steering | 5.4% | 481 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Headlamp aim | 568 |
| 2 | Catalyst emissions | 559 |
| 3 | Track rod end | 446 |
| 4 | Stop lamp | 404 |
| 5 | Position lamp | 401 |
| 6 | Joints | 384 |
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 | 38.2% | 3,392 |
| 2 | Suspension | 32.8% | 2,909 |
| 3 | Tyres | 26.5% | 2,356 |
| 4 | Body, structure & corrosion | 20.4% | 1,810 |
| 5 | Emissions & environmental | 15.4% | 1,369 |
| 6 | Other defects | 14.2% | 1,263 |
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 | 61 | 22.9% |
| 30-60k | 339 | 20.9% |
| 60-90k | 1,158 | 24.5% |
| 90-120k | 2,288 | 26.2% |
| 120-150k | 2,597 | 26.4% |
| 150k+ | 2,424 | 26.1% |
Failure rate by age
By fuel type
| Fuel | Tests | Fail rate |
|---|---|---|
| Petrol | 7,002 | 25.4% |
| Diesel | 1,876 | 27.4% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 2,697 | 27.6% |
| 2022 | 2,123 | 26.7% |
| 2023 | 1,705 | 24.5% |
| 2024 | 1,305 | 24.4% |
| 2025 | 1,048 | 23.4% |
What to check before buying a 2003 Leon
The failure pattern for this year is specific enough to inspect against: lighting & signalling accounted for 16.6% of tests. Start there.
- Lighting & signalling (16.6% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Brakes (9.9% 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.
- Suspension (9.7% 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.
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 SEAT Leons pass their MOT?
74.2% of the 8,878 2003 SEAT Leon MOT tests in this dataset passed — a 25.8% fail rate.
What is the most common MOT failure on a 2003 SEAT Leon?
Lighting & signalling, recorded in 16.6% of tests, followed by brakes (9.9%).
Does the 2003 Leon get worse with mileage?
Its MOT fail rate rises from 22.9% in the 0-30k band to 26.1% in the 150k+ band.
Methodology & source. Based on 8,878 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.