2021 Porsche 911 · 1,505 MOT tests
2021 Porsche 911 reliability
2021 Porsche 911s fail 3.4% of first MOT tests, 62% fewer MOT fails than the average car its age and mileage, ranking 16 of 25 911 years (1,505 DVSA tests, 2022 to 2024).
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- first-time fail rate (all Porsche 911s: 10.4%)
- 3.4%
- first-time fail rate (all Porsche 911s: 10.4%)
- fails than cars of the same age and mileage
- 62% fewer
- fails than cars of the same age and mileage
- typical miles at its MOT, aged about 3
- 12,069
- typical miles at its MOT, aged about 3
- MOT tests, 2022 to 2024
- 1,505
- MOT tests, 2022 to 2024
Year on year
2021 against the years either side
- 2020 cars: 62% fewer MOT fails than the average car its age (the 2021 car does worse)
- Strong point: tyres, 13% fewer fails than comparable cars.
- Plates: a 2021 car carries a 70 plate (January–February 2021), or a 21 plate (March–August 2021), or a 71 plate (September–December 2021).
Common problems
What fails on a 2021 Porsche 911
Fail rate by area
- Tyres2.6%
- Number plates and VIN0.3%
- Lights and electrics0.3%
- Suspension0.1%
- Windscreen, wipers and mirrors0.1%
- Steering0.1%
- Brakes0.1%
Average for cars of the same age and mileage
Top failures
Tyre cut reaching ply or cords 0.6%
A cut reaching the ply or cords weakens the tyre and can cause a burst, so it must be replaced.
Tyre tread below 1.6mm 0.4%
Tread below 1.6mm is illegal and reduces grip in wet conditions, so the tyre must be replaced.
Tyre bulge from structural failure 0.27%
A bulge means the tyre's structure has failed and it could burst suddenly, so it must be replaced at once.
Number plate does not meet standards 0.2%
The plate does not meet legal specifications, so it must be replaced with a compliant one before the car is driven.
Headlamp aim set too high 0.13%
Headlamps aimed too high can dazzle other drivers, and adjusting them is usually a quick job.
Tyre lump from structural separation 0.13%
A tyre lump means its structure has partly failed and it could burst, so replace it immediately.
Common advisories
Tyre worn close to legal limit (2.26%) · Nail in tyre, monitor (1.06%) · Tyre slightly damaged or cracking (0.8%) · Tyre has a shallow cut (0.53%) · Tyre worn close to legal limit (0.33%) · Brake disc pitted or scored (0.2%)
Other years
Every Porsche 911 year
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Source: DVSA anonymised MOT results, 2022 to 2024, class 4 normal tests.
Is a 2021 Porsche 911 reliable?
2021 Porsche 911s fail 3.4% of first MOT tests, 62% fewer MOT fails than the average car its age and mileage, ranking 16 of 25 911 years (1,505 DVSA tests, 2022 to 2024).
What fails on a 2021 Porsche 911 MOT?
Most often tyre cut reaching ply or cords (0.6% of tests), tyre tread below 1.6mm (0.4% of tests), tyre bulge from structural failure (0.27% of tests).
How many miles should a 2021 Porsche 911 have done?
At its MOT aged about 3, a typical 2021 Porsche 911 shows 12,069 miles. Much higher or lower is worth asking about.
What plate is a 2021 car?
A car first registered in 2021 carries a 70 plate (January–February 2021), or a 21 plate (March–August 2021), or a 71 plate (September–December 2021).
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