1999 Porsche 911 · 5,657 MOT tests
1999 Porsche 911 reliability
1999 Porsche 911s fail 19% of first MOT tests, 49% fewer MOT fails than the average car its age and mileage, ranking 23 of 25 911 years (5,657 DVSA tests, 2022 to 2024).
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- first-time fail rate (all Porsche 911s: 10.4%)
- 19%
- first-time fail rate (all Porsche 911s: 10.4%)
- fails than cars of the same age and mileage
- 49% fewer
- fails than cars of the same age and mileage
- typical miles at its MOT, aged about 24
- 93,009
- typical miles at its MOT, aged about 24
- MOT tests, 2022 to 2024
- 5,657
- MOT tests, 2022 to 2024
Year on year
1999 against the years either side
- 1998 cars: 46% fewer MOT fails than the average car its age (the 1999 car does better)
- 2000 cars: 48% fewer MOT fails than the average car its age (the 1999 car does better)
- Strong point: suspension, 77% fewer fails than comparable cars.
Common problems
What fails on a 1999 Porsche 911
Fail rate by area
- Lights and electrics9%
- Brakes4.4%
- Exhaust, emissions and leaks3.8%
- Suspension3%
- Windscreen, wipers and mirrors2.6%
- Tyres2.5%
- Body, chassis and structure2.3%
Average for cars of the same age and mileage
Top failures
Lambda reading outside specified limits 1.61%
An out-of-range lambda reading suggests poor fuel mixture or a failing catalytic converter, so diagnosis is needed.
Rigid brake pipe excessively corroded 1.36%
Badly corroded brake pipes can leak or fail, which can cause a loss of braking, so repair is urgent.
Position lamp not working 1.36%
A failed position lamp makes the car harder to see in poor light and is illegal, so it must be repaired.
Tyre tread below 1.6mm 1.06%
Tread below 1.6mm is illegal and reduces grip in wet conditions, so the tyre must be replaced.
Headlamp beam pattern obviously incorrect 0.99%
A wrongly shaped beam can dazzle other drivers and reduce your own view of the road, so the lamps need correcting.
Wiper blade not clearing windscreen 0.87%
Wipers that do not clear the windscreen reduce visibility in rain, which is a safety risk, so replace them.
Common advisories
Brake pipes corroded and greasy (7.69%) · Tyre worn close to legal limit (6.56%) · Brake disc pitted or scored (5.99%) · Engine oil leak, not excessive (4.88%) · Tyre slightly damaged or cracking (2.95%) · Linkage ball joint slight play (2.63%)
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 1999 Porsche 911 reliable?
1999 Porsche 911s fail 19% of first MOT tests, 49% fewer MOT fails than the average car its age and mileage, ranking 23 of 25 911 years (5,657 DVSA tests, 2022 to 2024).
What fails on a 1999 Porsche 911 MOT?
Most often lambda reading outside specified limits (1.61% of tests), rigid brake pipe excessively corroded (1.36% of tests), position lamp not working (1.36% of tests).
How many miles should a 1999 Porsche 911 have done?
At its MOT aged about 24, a typical 1999 Porsche 911 shows 93,009 miles. Much higher or lower is worth asking about.
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