1997 Porsche Boxster — MOT failures & pass rate
The 1997 Porsche Boxster passed 80.0% of its 2,426 recorded MOT tests. Coupes & convertibles of a similar age fail at 20.9%, so the 1997 Boxster sits squarely on the average. Failures cluster in lighting & signalling, emissions & environmental and brakes.
What the MOT record shows
No single area dominates — lighting & signalling (11.5%) and emissions & environmental (8.6%) are close, so failures are spread across several systems rather than one weak point.
At component level the recurring items are catalyst emissions, headlamp aim and horn — catalyst emissions alone was recorded 228 times.
Condition tracks the odometer closely. Failures run at 11.3% in the 0-30k band and 18.9% in the 150k+ band, a 7.6-point spread.
Advisories point at the next bill rather than this one: brakes was flagged on 29.5% of tests without failing them.
The trend is improving — the fail rate fell from 21.4% in 2021 to 16.8% in 2025, as the worst-kept examples leave the fleet.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 11.5% | 280 |
| 2 | Emissions & environmental | 8.6% | 209 |
| 3 | Brakes | 5.0% | 121 |
| 4 | Suspension | 4.7% | 113 |
| 5 | Visibility | 3.8% | 91 |
| 6 | Tyres | 3.2% | 78 |
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 | 228 |
| 2 | Headlamp aim | 118 |
| 3 | Horn | 90 |
| 4 | Rigid brake pipes | 88 |
| 5 | Headlamp | 79 |
| 6 | Wipers | 72 |
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 | 29.5% | 716 |
| 2 | Suspension | 23.6% | 572 |
| 3 | Tyres | 18.1% | 439 |
| 4 | Emissions & environmental | 13.2% | 320 |
| 5 | Lighting & signalling | 8.4% | 203 |
| 6 | Body, structure & corrosion | 7.0% | 170 |
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 | 62 | 11.3% |
| 30-60k | 340 | 11.2% |
| 60-90k | 666 | 21.2% |
| 90-120k | 834 | 20.0% |
| 120-150k | 422 | 26.1% |
| 150k+ | 90 | 18.9% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 552 | 21.4% |
| 2022 | 518 | 19.9% |
| 2023 | 498 | 22.7% |
| 2024 | 440 | 18.2% |
| 2025 | 418 | 16.8% |
What to check before buying a 1997 Boxster
On a 1997 Boxster, lighting & signalling is what the MOT record says goes wrong most — it appeared in 11.5% of tests. Check these areas before you commit.
- Lighting & signalling (11.5% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Emissions & environmental (8.6% of tests): More common on older diesels (DPF/EGR) — can be expensive; check for warning lights and smoke. Typical repair: £100–£600.
- Brakes (5.0% 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.
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 1997 Porsche Boxsters pass their MOT?
80.0% of the 2,426 1997 Porsche Boxster MOT tests in this dataset passed — a 20.0% fail rate.
What is the most common MOT failure on a 1997 Porsche Boxster?
Lighting & signalling, recorded in 11.5% of tests, followed by emissions & environmental (8.6%).
Does the 1997 Boxster get worse with mileage?
Its MOT fail rate rises from 11.3% in the 0-30k band to 18.9% in the 150k+ band.
Methodology & source. Based on 2,426 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.