2019 Porsche 911 Carrera 4 — MOT failures & pass rate
Across 256 MOT tests, the 2019 Porsche 911 Carrera 4 recorded a 94.5% pass rate. Against all cars of a similar age (10.3% fail rate), the 2019 911 Carrera 4 comes out 4.8pp better. Failures cluster in tyres, lighting & signalling and other defects.
What the MOT record shows
No single area dominates — tyres (4.3%) and lighting & signalling (1.9%) are close, so failures are spread across several systems rather than one weak point.
At component level the recurring items are headlamp aim, tread depth and registration plates — headlamp aim alone was recorded 8 times.
Advisories point at the next bill rather than this one: tyres was flagged on 13.7% of tests without failing them.
The trend is improving — the fail rate fell from 7.8% in 2022 to 3.1% in 2025, as the worst-kept examples leave the fleet.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Tyres | 4.3% | 11 |
| 2 | Lighting & signalling | 1.9% | 5 |
| 3 | Other defects | 0.8% | 2 |
| 4 | Emissions & environmental | 0.4% | 1 |
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 | Tread depth | 7 |
| 3 | Registration plates | 3 |
| 4 | Reversing lamps | 1 |
| 5 | Malfunction indicator lamp | 1 |
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 | 13.7% | 35 |
| 2 | Other defects | 5.5% | 14 |
| 3 | Brakes | 2.7% | 7 |
| 4 | Visibility | 2.3% | 6 |
| 5 | Emissions & environmental | 0.8% | 2 |
| 6 | Lighting & signalling | 0.4% | 1 |
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 | 218 | 5.1% |
| 30-60k | 38 | 7.9% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2022 | 51 | 7.8% |
| 2023 | 70 | 5.7% |
| 2024 | 70 | 5.7% |
| 2025 | 65 | 3.1% |
What to check before buying a 2019 911 Carrera 4
On a 2019 911 Carrera 4, tyres is what the MOT record says goes wrong most — it appeared in 4.3% of tests. Check these areas before you commit.
- Tyres (4.3% 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.
- Lighting & signalling (1.9% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Other defects (0.8% of tests): Miscellaneous items not in the main categories. Typical repair: varies.
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 2019 Porsche 911 Carrera 4s pass their MOT?
94.5% of the 256 2019 Porsche 911 Carrera 4 MOT tests in this dataset passed — a 5.5% fail rate.
What is the most common MOT failure on a 2019 Porsche 911 Carrera 4?
Tyres, recorded in 4.3% of tests, followed by lighting & signalling (1.9%).
Does the 2019 911 Carrera 4 get worse with mileage?
Its MOT fail rate rises from 5.1% in the 0-30k band to 7.9% in the 30-60k band.
Methodology & source. Based on 256 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.