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MOT reliability

Porsche 911

74,656 vehicles · 964,972 completed MOT tests analysed
85%
MOT pass rate

Based on 74,656 Porsche 911 vehicles and 964,972 completed MOT tests, the Porsche 911 has an overall 85% pass rate, with an average recorded mileage of 70,982 miles.

74,656
Vehicles
964,972
MOT tests
2,778
Avg miles / year
1.1
Faults per test
1%
Dangerous-fault share

Porsche 911 problem areas

Where faults occur most across all Porsche 911 MOT tests:

  • Other73%
  • Tyres, wheels & suspension17%
  • Brakes14%
  • Lamps & electrical5%
  • Emissions & nuisance4%
  • Body & structure2%
  • Steering2%
  • Visibility2%

Porsche 911 pass rate by age

How the Porsche 911's MOT pass rate changes as it ages (buckets with 20+ tests).

Age (years)TestsPass rate
152578%
22,08789%
343,96390%
446,41590%
547,77990%
649,12289%
749,29488%
848,75787%
947,63286%
1046,78486%
1145,26785%
1243,64484%
1341,75284%
1439,94084%
1538,42984%
1637,42284%
1735,91283%
1833,96883%
1931,44183%
2028,57183%

Fuel types: Petrol (74,444), LPG (120), Other (48), Electric (21), Diesel (17), Gas Bi-Fuel (4), Gas (2)

Most common Porsche 911 MOT faults

These are the faults and advisories recorded most often across Porsche 911 MOT tests:

  1. Nearside Rear Tyre worn close to the legal limit (4.1.E.1) (25,504 times)
  2. Offside Rear Tyre worn close to the legal limit (4.1.E.1) (24,637 times)
  3. Under-trays fitted obscuring some underside components (20,564 times)
  4. Nearside Front Tyre worn close to the legal limit (4.1.E.1) (16,534 times)
  5. Offside Front Tyre worn close to the legal limit (4.1.E.1) (15,981 times)
  6. Oil leak, but not excessive (8.4.1 (a) (i)) (12,710 times)
  7. Nearside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e)) (12,215 times)
  8. Offside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e)) (11,663 times)
  9. Oil leak (10,486 times)
  10. Offside Front Brake pipe corroded, covered in grease or other material (1.1.11 (c)) (8,465 times)
  11. Engine covers fitted obscuring some components in the engine bay (7,953 times)
  12. Nearside Rear Tyre tread depth below requirements of 1.6mm (4.1.E.1) (7,286 times)
  13. Offside Front Brake pipe slightly corroded (3.6.B.2c) (7,134 times)
  14. Windscreen has damage to an area less than a 40mm circle outside zone 'A' (8.3.1d) (6,895 times)
  15. Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e)) (6,788 times)

Porsche 911 pass rate by registration year

YearVehiclesTestsPass rateAvg mileage
2025 1 1 100% 585
2024 2 2 100% 3,941
2023 11 12 100% 9,558
2022 23 32 94% 10,016
2021 32 53 87% 25,931
2020 901 2,732 95% 23,382
2019 2,578 10,304 95% 24,237
2018 2,413 13,373 94% 23,137
2017 2,153 13,824 95% 29,375
2016 2,050 14,105 95% 32,344
2015 1,984 16,057 94% 36,042
2014 1,817 16,427 94% 38,292
2013 1,441 14,600 94% 47,114
2012 1,653 18,825 92% 51,213
2011 1,351 16,506 91% 46,633
2010 1,921 25,073 90% 51,011
2009 1,653 23,441 89% 60,858
2008 2,313 34,069 89% 58,539
2007 3,260 49,923 88% 60,760
2006 3,723 61,651 86% 68,953
2005 3,839 66,150 86% 71,750
2004 3,379 61,085 84% 72,808
2003 3,609 70,117 83% 80,446
2002 3,482 67,066 82% 85,139
2001 2,339 44,654 82% 90,204
2000 1,575 28,655 81% 92,982
1999 2,088 38,503 80% 98,550
1998 1,876 33,192 80% 102,837
1997 1,285 20,997 85% 80,815
1996 1,591 25,971 85% 88,388
1995 1,150 17,827 84% 89,861
1994 964 14,809 84% 101,180
1993 600 8,068 83% 95,372
1992 580 6,576 83% 98,167
1991 802 9,363 81% 108,781
1990 1,506 21,100 82% 113,542
1989 1,129 15,830 83% 91,849
1988 750 10,966 81% 104,253
1987 754 10,934 80% 111,031
1986 731 9,892 78% 108,565
1985 572 7,575 78% 111,676
1984 529 6,772 78% 113,042
1983 538 5,699 79% 108,558
1982 560 5,982 77% 116,252
1981 445 4,189 77% 110,894
1980 386 3,834 76% 114,822
1979 443 3,847 75% 111,300
1978 252 2,100 77% 104,037
1977 268 2,237 76% 109,292
1976 185 1,438 77% 98,767
1975 125 864 78% 71,064
1974 123 835 78% 57,941
1973 285 2,363 80% 55,149
1972 229 1,848 81% 56,075
1971 128 1,016 81% 67,350
1970 90 633 77% 54,123
1969 58 347 83% 59,741
1968 64 352 81% 48,774
1967 50 353 84% 45,764
1966 29 161 83% 50,814
1965 34 158 83% 42,685
1964 4 16 81% 16,637
1959 2 4 100% 63,242
1958 3 55 78% 64,181

Porsche 911 reliability FAQ

Across 74,656 Porsche 911 vehicles in our MOT data, 85% pass the MOT (a 15% failure rate), with about 1.1 faults or advisories recorded per test.

The most frequently recorded Porsche 911 MOT issues are: 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.

The typical Porsche 911 in our data has covered around 70,982 miles.

Compare the Porsche 911

See how the Porsche 911 stacks up against other Porsche models on MOT reliability:

911 vs Boxster 911 vs Cayenne 911 vs Macan 911 vs Cayman

Check a specific Porsche 911

Enter a registration to see that exact vehicle's full MOT history, advisories and recurring faults.

See all Porsche models · Learn about common MOT failures · what an MOT checks