MOT performance
2004 Porsche 911: MOT pass rate and common failures
Of 4,825 MOT tests on 2004-registered Porsche 911s in 2023–2024 (on average 19 years old at test, median 71,705 miles), 82.9% passed first time, 4.9 points lower than the Porsche 911 overall. Allowing for age, mileage and fuel, 2004 Porsche 911s failed 57% less often than comparable cars.
4,825 MOT tests on 2,588 vehicles, 2023–2024 · Source: DVSA (Open Government Licence) · Analysis: 73 Auto
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| Figure | Value | Basis |
|---|---|---|
| First-time pass rate | 82.9% | ±1.1 pts (95%), n = 4,825 |
| All Porsche 911s | 87.9% | n = 100,223 |
| Failures vs similar cars | 0.43× | same age, mileage and fuel = 1.00 |
| Tests with a dangerous defect | 3.9% | n = 4,825 |
| Average age at test | 19 years | n = 4,825 |
Where 2004 Porsche 911s fail
| Area | Tests failed on it | vs similar cars |
|---|---|---|
| Lights, reflectors and electrical | 6.6% | -65% |
| Brakes | 3.7% | -66% |
| Noise, emissions and leaks | 3.5% | -47% |
| Tyres | 3.5% | -42% |
| Body, chassis and structure | 2.5% | -65% |
| Driver's view of the road | 1.9% | -74% |
| Suspension | 1.7% | -87% |
| Steering | 0.7% | -76% |
| Registration plates and VIN | 0.6% | -5% |
| Seat belts and airbags | 0.5% | -79% |
| Road wheels | 0.2% | -37% |
Most common failure items
| Item | Area | Share of tests |
|---|---|---|
| Catalyst emissions: Lambda reading after 2nd fast idle outside specified limits | Noise, emissions and leaks | 2.34% |
| Position lamp: not working | Lights, reflectors and electrical | 1.93% |
| Rigid brake pipes: excessively corroded | Brakes | 1.86% |
| Joints: constant velocity boot split or insecure, no longer prevents the ingress of dirt | Body, chassis and structure | 1.35% |
| Headlamp aim: too high | Lights, reflectors and electrical | 1.29% |
Check a specific 2004 Porsche 911
Enter a UK registration to see that car's own MOT history and what it is likely to cost to own. Your first check is free and shows the vehicle summary and its headline ownership cost. The category-by-category breakdown is part of a paid check.
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About this data. These are MOT test results, not a measure of mechanical reliability: a car's MOT outcome reflects its condition on the day, which depends on how it has been maintained and driven as well as how it was built. Figures cover class 4 vehicles (cars and light vans), normal tests only (retests excluded), outcomes pass, fail and pass after rectification at the station; vehicles at least 2.5 years old at test. Tests from 2023-01-01 to 2024-12-30. “Compared with similar cars” means compared with the national rate for cars of the same age, mileage band and fuel. Contains public sector information licensed under the Open Government Licence v3.0. Makes and models are matched to 73 Auto's vehicle catalogue; tests that can't be matched are left out rather than guessed. See how the MOT figures are produced.