1999 Caterham Seven S3 — MOT failures & pass rate
Across 425 MOT tests, the 1999 Caterham Seven S3 recorded an 88.7% pass rate. That is 14.8 percentage points better than all cars of a similar age, which fail at 26.0%. Failures cluster in lighting & signalling, emissions & environmental and brakes.
What the MOT record shows
Lighting & signalling dominates the failure mix at 7.5% of all tests — 3.8 points clear of emissions & environmental, so it is the first thing to check.
At component level the recurring items are catalyst emissions, headlamp aim and service brake performance — catalyst emissions alone was recorded 24 times.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 7.5% | 32 |
| 2 | Emissions & environmental | 3.8% | 16 |
| 3 | Brakes | 3.5% | 15 |
| 4 | Suspension | 1.7% | 7 |
| 5 | Visibility | 1.7% | 7 |
| 6 | Tyres | 1.4% | 6 |
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 | 24 |
| 2 | Headlamp aim | 18 |
| 3 | Service brake performance | 11 |
| 4 | Tread depth | 9 |
| 5 | Wipers | 7 |
| 6 | Rear fog lamp | 7 |
Top advisory categories
Advisories aren't failures, but they flag work likely needed soon — useful when budgeting.
| # | Category | % of tests with advisory | Tests |
|---|---|---|---|
| 1 | Tyres | 7.8% | 33 |
| 2 | Suspension | 6.3% | 27 |
| 3 | Brakes | 4.0% | 17 |
| 4 | Emissions & environmental | 3.8% | 16 |
| 5 | Other defects | 2.8% | 12 |
| 6 | Steering | 2.6% | 11 |
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 | 262 | 12.2% |
| 30-60k | 138 | 9.4% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 86 | 11.6% |
| 2022 | 92 | 13.0% |
| 2023 | 87 | 11.5% |
| 2024 | 77 | 7.8% |
| 2025 | 83 | 12.0% |
What to check before buying a 1999 Seven S3
On a 1999 Seven S3, lighting & signalling is what the MOT record says goes wrong most — it appeared in 7.5% of tests. Check these areas before you commit.
- Lighting & signalling (7.5% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Emissions & environmental (3.8% of tests): More common on older diesels (DPF/EGR) — can be expensive; check for warning lights and smoke. Typical repair: £100–£600.
- Brakes (3.5% 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.
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 Caterham Seven S3s pass their MOT?
88.7% of the 425 1999 Caterham Seven S3 MOT tests in this dataset passed — a 11.3% fail rate.
What is the most common MOT failure on a 1999 Caterham Seven S3?
Lighting & signalling, recorded in 7.5% of tests, followed by emissions & environmental (3.8%).
Does the 1999 Seven S3 get worse with mileage?
Its MOT fail rate rises from 12.2% in the 0-30k band to 9.4% in the 30-60k band.
Methodology & source. Based on 425 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.