2005 Caterham Seven S3 — MOT failures & pass rate
The 2005 Caterham Seven S3 passed 90.9% of its 298 recorded MOT tests. Against all cars of a similar age (27.6% fail rate), the 2005 Seven S3 comes out 18.6pp better. Failures cluster in lighting & signalling, emissions & environmental and suspension.
What the MOT record shows
One area stands out: lighting & signalling, recorded in 6.7% of tests against 3.0% for the next-worst category.
At component level the recurring items are headlamp aim, catalyst emissions and headlamp — headlamp aim alone was recorded 8 times.
Suspension is the most common advisory, noted on 16.1% of tests — work that passed today but is likely due soon.
The trend is worsening — 6.6% of tests failed in 2021 against 9.1% in 2025, the usual pattern as a fleet ages.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 6.7% | 20 |
| 2 | Emissions & environmental | 3.0% | 9 |
| 3 | Suspension | 2.0% | 6 |
| 4 | Visibility | 1.7% | 5 |
| 5 | Other defects | 1.3% | 4 |
| 6 | Tyres | 1.0% | 3 |
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 | 8 |
| 2 | Catalyst emissions | 7 |
| 3 | Headlamp | 6 |
| 4 | Registration plates | 5 |
| 5 | Stop lamp | 4 |
| 6 | Position lamp | 3 |
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 | 16.1% | 48 |
| 2 | Tyres | 7.4% | 22 |
| 3 | Other defects | 3.7% | 11 |
| 4 | Steering | 3.4% | 10 |
| 5 | Brakes | 2.7% | 8 |
| 6 | Lighting & signalling | 2.0% | 6 |
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 | 202 | 7.4% |
| 30-60k | 87 | 12.6% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 61 | 6.6% |
| 2022 | 65 | 9.2% |
| 2023 | 63 | 11.1% |
| 2024 | 54 | 9.3% |
| 2025 | 55 | 9.1% |
What to check before buying a 2005 Seven S3
The failure pattern for this year is specific enough to inspect against: lighting & signalling accounted for 6.7% of tests. Start there.
- Lighting & signalling (6.7% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Emissions & environmental (3.0% of tests): More common on older diesels (DPF/EGR) — can be expensive; check for warning lights and smoke. Typical repair: £100–£600.
- Suspension (2.0% 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 2005 Caterham Seven S3s pass their MOT?
90.9% of the 298 2005 Caterham Seven S3 MOT tests in this dataset passed — a 9.1% fail rate.
What is the most common MOT failure on a 2005 Caterham Seven S3?
Lighting & signalling, recorded in 6.7% of tests, followed by emissions & environmental (3.0%).
Does the 2005 Seven S3 get worse with mileage?
Its MOT fail rate rises from 7.4% in the 0-30k band to 12.6% in the 30-60k band.
Methodology & source. Based on 298 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.