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Porsche 911 - 1991

71.6 faults per 100 tests
Year average for all cars of 1991 is 263.4 faults per 100 tests
Dataset: MOT tests in Great Britain (period: 2024-01-01 to 2025-09-10) for Porsche 911, model year 1991. Sample size: 405 cars, 677 tests and 485 recorded faults.
0%
Less faults compared to the average car of same model year

Quick summary

Total: 405 cars

The 1991 Porsche 911 has a significantly lower overall defect rate, with 72.8% fewer issues reported compared to the yearly average of similar vehicles, at 72 defects per 100 cars. Notably, the 911 excels in several categories, particularly in brakes and steering, where it shows a remarkable reduction in defects compared to the average. Mileage-related trends indicate that defects decrease as mileage increases, with the lowest issues reported in the highest mileage bracket. This model stands out positively across various categories, including visibility and lights and electrics, suggesting reliable performance in critical areas.

Cars by mileage segment

Total: 405 cars

More model years for Porsche 911

1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022

Other models from Porsche

Porsche 718 CAYMAN GT4 Porsche 718 SPYDER Porsche 911 Porsche 924 Porsche 928 Porsche 944 Porsche 968 Porsche BOXSTER Porsche CARRERA Porsche CAYENNE Porsche MACAN Porsche PANAMERA Porsche TAYCAN

Categories

Brakes
▲ 86.5% better
14.2 faults / 100 tests
Year avg: 105.2 / 100 tests
  • Brake hose ferrules: excessively corroded
  • Anti-slip provision missing, loose or worn smooth
  • Excessive fluctuation in brake effort through each wheel revolution
  • Brake disc or drum: insecure, fractured or otherwise likely to fail
  • Brake lining or pad: worn below 1.5mm
Steering
▲ 89.7% better
3.0 faults / 100 tests
Year avg: 29.0 / 100 tests
  • Power steering fluid leaking or system malfunctioning
  • Power steering pipe, hose or wiring: excessively damaged or corroded
  • Steering rack gaiter or ball joint dust cover: missing or no longer prevents the ingress of dirt etc.
  • A steering ball joint: with excessive wear or free play
  • Steering rack gaiter or ball joint dust cover: damaged or deteriorated
Visibility
▲ 31.6% better
14.5 faults / 100 tests
Year avg: 21.2 / 100 tests
  • Windscreen washers not working or not providing sufficient fluid to clear the windscreen
  • Windscreen or window damaged or seriously discoloured: but not adversely affecting driver’s view
  • Wiper blade: defective
  • Windscreen washers not working or not providing sufficient fluid to clear the windscreen
  • Wiper blade: missing or obviously not clearing the windscreen
Lights & Electrics
▲ 45.4% better
32.5 faults / 100 tests
Year avg: 59.5 / 100 tests
  • A rear registration plate lamp or light source missing or inoperative: when rear registration plate has 2 or more lamps or light sources
  • An obligatory rear fog lamp missing, or a front or rear fog lamp inoperative or in the case of a multiple light source more than 1/2 not functioning
  • The aim of a headlamp is not within limits laid down in the requirements
  • Lamp emitted colour, position or intensity not in accordance with the requirements
  • Indicator or hazard warning switch: does not operate in accordance with the requirements
Wheels & Suspension
▲ 74.7% better
44.6 faults / 100 tests
Year avg: 176.5 / 100 tests
  • A tyre: with a lump, bulge or tear … or with cords exposed or damaged
  • A suspension pin, bush, joint or bearing: excessively worn
  • A suspension joint dust cover: severely deteriorated
  • Tyre tread depth not in accordance with the requirements
  • A spring: or spring component fractured or seriously weakened
Body/Structure
▲ 91.7% better
5.3 faults / 100 tests
Year avg: 64.1 / 100 tests
  • Vehicle structure corroded to the extent that: the rigidity of the assembly is significantly reduced
  • A transmission shaft constant velocity joint boot: severely deteriorated
  • A transmission shaft constant velocity joint boot: missing, split, insecure or no longer prevents the ingress of dirt
  • Fuel system: leaking, or missing or ineffective filler cap
  • Body, cab or chassis: excessively corroded at mounting points
Equipment
▲ 82.6% better
3.2 faults / 100 tests
Year avg: 18.4 / 100 tests
  • Audible warning:
  • A seat belt: webbing or flexible stalk significantly stretched or weakened
  • A seat belt: or flexible stalk damaged
  • Seat belt not functioning as intended or of an incorrect type
Other
▲ 50.9% better
26.0 faults / 100 tests
Year avg: 52.9 / 100 tests
  • Fluid: leaking excessively and likely to harm the environment or to pose a safety risk to other road users
  • Emissions levels exceed the manufacturer’s specified limits
  • Emissions test unable to be completed
  • Emissions levels exceed default limits
  • Lambda coefficient outside the default limits or the range specified by the manufacturer

Fault rate by mileage segment

Model    Year average
0 474 0–31,000 mi 31,000–62,000 62,000–93,000 93,000–124,000 124,000+
* Metric: faults per 100 tests.

Most common faults (Top 10)

Fluid: leaking excessively and likely to harm the environment or to pose a safety risk to other road users
ADVISORY
Occurrences: 75
Tyre tread depth not in accordance with the requirements
ADVISORY
Occurrences: 51
A tyre: with a lump, bulge or tear … or with cords exposed or damaged
ADVISORY
Occurrences: 30
The aim of a headlamp is not within limits laid down in the requirements
FAIL
Occurrences: 29
Wiper blade: defective
MINOR
Occurrences: 22
Brake hose ferrules: excessively corroded
ADVISORY
Occurrences: 18
A rear registration plate lamp or light source missing or inoperative: when rear registration plate has 2 or more lamps or light sources
MINOR
Occurrences: 17
A spring: or spring component fractured or seriously weakened
ADVISORY
Occurrences: 13
A suspension pin, bush, joint or bearing: excessively worn
ADVISORY
Occurrences: 11
Windscreen washers not working or not providing sufficient fluid to clear the windscreen
FAIL
Occurrences: 11

Serious faults (Top 10)

The aim of a headlamp is not within limits laid down in the requirements
FAIL
Occurrences: 29
Windscreen washers not working or not providing sufficient fluid to clear the windscreen
FAIL
Occurrences: 11
An obligatory rear fog lamp missing, or a front or rear fog lamp inoperative or in the case of a multiple light source more than 1/2 not functioning
FAIL
Occurrences: 9
A suspension joint dust cover: missing or no longer prevents the ingress of dirt etc.
FAIL
Occurrences: 7
Emissions levels exceed default limits
FAIL
Occurrences: 6
Audible warning:
FAIL
Occurrences: 6
A transmission shaft constant velocity joint boot: missing, split, insecure or no longer prevents the ingress of dirt
FAIL
Occurrences: 6
A direction indicator: lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning
FAIL
Occurrences: 5
Wiper blade: missing or obviously not clearing the windscreen
FAIL
Occurrences: 4
A shock absorber damaged … or showing signs of severe leakage
FAIL
Occurrences: 3