Porsche 911 vs Porsche 914: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Porsche 911
85%
MOT pass rate · 74,656 vehicles
More reliable
Porsche 914
77%
MOT pass rate · 263 vehicles
Verdict: On MOT pass rate, the Porsche 911 is the more reliable of the two — 85% pass first time versus 77%. It's one signal among several; check the full breakdown below.
Head to head
| Measure | Porsche 911 | Porsche 914 |
|---|---|---|
| MOT pass rate | 85% ✓ | 77% |
| MOT failure rate | 15% ✓ | 23% |
| Faults & advisories per test | 1.1 ✓ | 1.5 |
| Dangerous-fault share | 1% | 1% |
| Average mileage | 70,982 mi | 53,373 mi |
| Sample size (vehicles) | 74,656 | 263 |
Most common faults
Porsche 911
- Nearside Rear Tyre worn close to the legal limit (4.1.E.1)
- Offside Rear Tyre worn close to the legal limit (4.1.E.1)
- Under-trays fitted obscuring some underside components
- Nearside Front Tyre worn close to the legal limit (4.1.E.1)
- Offside Front Tyre worn close to the legal limit (4.1.E.1)
- Oil leak, but not excessive (8.4.1 (a) (i))
Porsche 914
- Windscreen washer provides insufficient washer liquid (8.2.3)
- Parking brake: efficiency below requirements (3.7.B.7)
- Offside Front wheel bearing has slight play (2.5.A.3c)
- Nearside Front wheel bearing has slight play (2.5.A.3c)
- Oil leak
- Horn not working (1.6.2a)
Reliability FAQ
On MOT pass rate, the Porsche 911 is the more reliable of the two — 85% pass first time versus 77%. It's one signal among several; check the full breakdown below.
Full Porsche 911 report Full Porsche 914 report Most reliable cars
Pass rates are computed over completed (pass/fail) MOT tests. Reliability also depends on age, mileage and upkeep — see each model's page for the full picture.