Porsche 718 Cayman Gt4 MOT pass rate & common failures
2,169 MOT tests on the Porsche 718 Cayman Gt4 (2019–2023) give it a 96.8% pass rate. That is 5.9 percentage points better than all cars of a similar age, which fail at 9.1%. Its most common failure areas are tyres, other defects and lighting & signalling.
What the MOT record shows
No single area dominates — tyres (1.8%) and other defects (1.1%) are close, so failures are spread across several systems rather than one weak point.
At component level the recurring items are registration plates, headlamp aim and tread depth — registration plates alone was recorded 30 times.
How it compares
By model year
Every 718 Cayman Gt4 model year with a usable sample. Years with their own detailed report are linked.
| Year | Tests | Pass rate | Fail rate | Most common failure |
|---|---|---|---|---|
| 2019 | 321 | 97.5% | 2.5% | Other defects |
| 2020 | 1,067 | 97.5% | 2.5% | Tyres |
| 2021 | 470 | 95.3% | 4.7% | Tyres |
| 2022 | 301 | 95.7% | 4.3% | Other defects |
Most common failures (all years)
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Tyres | 1.8% | 40 |
| 2 | Other defects | 1.1% | 25 |
| 3 | Lighting & signalling | 0.5% | 12 |
| 4 | Visibility | 0.3% | 7 |
| 5 | Brakes | 0.2% | 5 |
| 6 | Emissions & environmental | 0.1% | 3 |
| 7 | Suspension | 0.1% | 1 |
| 8 | Road wheels | 0.1% | 1 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Registration plates | 30 |
| 2 | Headlamp aim | 12 |
| 3 | Tread depth | 11 |
| 4 | Washers | 5 |
| 5 | Headlamp cleaning device | 4 |
| 6 | Brake discs | 4 |
| 7 | Service brake performance | 2 |
| 8 | Tyre pressure monitoring system | 2 |
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 | 5.3% | 114 |
| 2 | Other defects | 1.6% | 35 |
| 3 | Visibility | 1.3% | 29 |
| 4 | Brakes | 0.7% | 16 |
| 5 | Suspension | 0.4% | 8 |
| 6 | Road wheels | 0.3% | 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 | 2,136 | 3.0% |
| 30-60k | 31 | 16.1% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2022 | 91 | 3.3% |
| 2023 | 445 | 1.8% |
| 2024 | 662 | 3.9% |
| 2025 | 971 | 3.4% |
What to check before buying a Porsche 718 Cayman Gt4
- Tyres (1.8% of tests): Usually a quick, known-cost fix, but check tread, age and uneven wear (which can hint at alignment or suspension issues). Typical repair: £50–£120 per tyre.
- Other defects (1.1% of tests): Miscellaneous items not in the main categories. Typical repair: varies.
- Lighting & signalling (0.5% 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
What is the MOT pass rate for the Porsche 718 Cayman Gt4?
96.8% of the 2,169 Porsche 718 Cayman Gt4 MOT tests in this dataset passed, a 3.2% fail rate, across model years 2019–2023.
What does the Porsche 718 Cayman Gt4 most often fail its MOT on?
Tyres, recorded in 1.8% of tests, then other defects (1.1%).
Methodology & source. Based on 2,169 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.