2004 Porsche 911 · 9,212 MOT tests
2004 Porsche 911 reliability
2004 Porsche 911s fail 16% of first MOT tests, 59% fewer MOT fails than the average car its age and mileage, ranking 17 of 25 911 years (9,212 DVSA tests, 2022 to 2024).
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- first-time fail rate (all Porsche 911s: 10.4%)
- 16%
- first-time fail rate (all Porsche 911s: 10.4%)
- fails than cars of the same age and mileage
- 59% fewer
- fails than cars of the same age and mileage
- typical miles at its MOT, aged about 19
- 71,054
- typical miles at its MOT, aged about 19
- MOT tests, 2022 to 2024
- 9,212
- MOT tests, 2022 to 2024
Year on year
2004 against the years either side
- 2003 cars: 54% fewer MOT fails than the average car its age (the 2004 car does better)
- 2005 cars: 63% fewer MOT fails than the average car its age (the 2004 car does worse)
- Strong point: suspension, 87% fewer fails than comparable cars.
- Plates: a 2004 car carries a 53 plate (January–February 2004), or a 04 plate (March–August 2004), or a 54 plate (September–December 2004).
Common problems
What fails on a 2004 Porsche 911
Fail rate by area
- Lights and electrics6.6%
- Exhaust, emissions and leaks3.2%
- Brakes3%
- Tyres2.9%
- Body, chassis and structure2.6%
- Suspension1.8%
- Windscreen, wipers and mirrors1.7%
Average for cars of the same age and mileage
Top failures
Lambda reading outside specified limits 1.73%
An out-of-range lambda reading suggests poor fuel mixture or a failing catalytic converter, so diagnosis is needed.
Position lamp not working 1.67%
A failed position lamp makes the car harder to see in poor light and is illegal, so it must be repaired.
Rigid brake pipe excessively corroded 1.25%
Badly corroded brake pipes can leak or fail, which can cause a loss of braking, so repair is urgent.
CV joint boot split or insecure 1.01%
A split CV boot lets dirt in and grease out, so the joint wears and may need full replacement.
Headlamp aim set too high 0.92%
Headlamps aimed too high can dazzle other drivers, and adjusting them is usually a quick job.
Tyre ply or cords exposed 0.87%
Exposed ply or cords can let the tyre fail suddenly, so the tyre must be replaced before the car is driven.
Common advisories
Brake pipes corroded and greasy (9.49%) · Tyre worn close to legal limit (6.56%) · Brake disc pitted or scored (6.55%) · Tyre slightly damaged or cracking (3.33%) · Engine oil leak, not excessive (3.05%) · Exhaust has minor gas leak (1.54%)
Other years
Every Porsche 911 year
The full picture: Porsche 911 reliability. Before you pay for any Porsche 911, a Full Check (£9.99) shows finance, stolen and write-off records the MOT can't.
Source: DVSA anonymised MOT results, 2022 to 2024, class 4 normal tests.
Is a 2004 Porsche 911 reliable?
2004 Porsche 911s fail 16% of first MOT tests, 59% fewer MOT fails than the average car its age and mileage, ranking 17 of 25 911 years (9,212 DVSA tests, 2022 to 2024).
What fails on a 2004 Porsche 911 MOT?
Most often lambda reading outside specified limits (1.73% of tests), position lamp not working (1.67% of tests), rigid brake pipe excessively corroded (1.25% of tests).
How many miles should a 2004 Porsche 911 have done?
At its MOT aged about 19, a typical 2004 Porsche 911 shows 71,054 miles. Much higher or lower is worth asking about.
What plate is a 2004 car?
A car first registered in 2004 carries a 53 plate (January–February 2004), or a 04 plate (March–August 2004), or a 54 plate (September–December 2004).
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