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Porsche 911 - 1999

165.4 faults per 100 tests
Year average for all cars of 1999 is 349.1 faults per 100 tests
Dataset: MOT tests in Great Britain (period: 2024-01-01 to 2025-09-10) for Porsche 911, model year 1999. Sample size: 1,433 cars, 2,881 tests and 4,766 recorded faults.
0%
Less faults compared to the average car of same model year

Quick summary

Total: 1,433 cars

The 1999 Porsche 911 has a significantly lower overall defect rate of 165 defects per 100 vehicles compared to the yearly average of 345, representing a 52% improvement. In terms of mileage-related trends, the defect rate rises with increased mileage but remains relatively lower than average across all mileage segments. Notably, this model excels in categories like brakes, steering, and body structure, with defect rates far below the average. While tyre wear is not specifically highlighted, the model's performance in critical areas positions it as a robust option compared to its contemporaries.

Cars by mileage segment

Total: 1,433 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
▲ 39.8% better
92.3 faults / 100 tests
Year avg: 153.4 / 100 tests
  • Brake pipe damaged or excessively corroded
  • Brake pipe damaged or excessively corroded
  • Brake lining or pad: worn below 1.5mm
  • Brake disc or drum: insecure, fractured or otherwise likely to fail
  • Brake hose ferrules: excessively corroded
Steering
▲ 69.1% better
8.0 faults / 100 tests
Year avg: 25.9 / 100 tests
  • Power steering pipe, hose or wiring: excessively damaged or corroded
  • Power steering fluid leaking or system malfunctioning
  • A steering ball joint: with excessive wear or free play
  • Steering rack gaiter or ball joint dust cover: damaged or deteriorated
  • A steering ball joint: with excessive wear or free play
Visibility
▲ 51.1% better
13.0 faults / 100 tests
Year avg: 26.6 / 100 tests
  • Windscreen or window damaged or seriously discoloured: but not adversely affecting driver’s view
  • Wiper blade: defective
  • Wiper blade: missing or obviously not clearing the windscreen
  • Wiper blade: missing or obviously not clearing the windscreen
  • Windscreen washers not working or not providing sufficient fluid to clear the windscreen
Lights & Electrics
▲ 32.7% better
49.1 faults / 100 tests
Year avg: 73.0 / 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
  • Headlamp reflector or lens: slightly defective
  • Beam image obviously incorrect
  • Lamp emitted colour, position or intensity not in accordance with the requirements
  • Product on the lens or light source which obviously reduces light intensity or changes emitted colour to other than white or yellow
Wheels & Suspension
▲ 56.3% better
116.7 faults / 100 tests
Year avg: 266.9 / 100 tests
  • A suspension pin, bush, joint or bearing: excessively worn
  • A tyre: with a lump, bulge or tear … or with cords exposed or damaged
  • A suspension component: excessively damaged or corroded
  • Tyre tread depth not in accordance with the requirements
  • A shock absorber damaged … or showing signs of severe leakage
Body/Structure
▲ 79.1% better
16.0 faults / 100 tests
Year avg: 76.5 / 100 tests
  • A transmission shaft constant velocity joint boot: severely deteriorated
  • Vehicle structure corroded to the extent that: the rigidity of the assembly is significantly reduced
  • Exhaust system has a major leak or is insecure
  • A transmission shaft constant velocity joint boot: missing, split, insecure or no longer prevents the ingress of dirt
  • Exhaust system has a major leak or is insecure
Equipment
▲ 82.8% better
3.3 faults / 100 tests
Year avg: 19.2 / 100 tests
  • An SRS malfunction indicator lamp (MIL) indicates a system malfunction
  • A seat belt: webbing or flexible stalk significantly stretched or weakened
  • Audible warning:
  • Audible warning control insecure
  • An SRS malfunction indicator lamp (MIL) indicates a system malfunction
Other
▲ 42.7% better
32.4 faults / 100 tests
Year avg: 56.5 / 100 tests
  • Lambda coefficient outside the default limits or the range specified by the manufacturer
  • Emissions levels exceed the manufacturer’s specified limits
  • Fluid: leaking excessively and likely to harm the environment or to pose a safety risk to other road users
  • Emissions levels exceed default limits
  • Emissions test unable to be completed

Fault rate by mileage segment

Model    Year average
0 538 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)

A suspension pin, bush, joint or bearing: excessively worn
ADVISORY
Occurrences: 532
Brake pipe damaged or excessively corroded
ADVISORY
Occurrences: 489
Brake disc or drum: insecure, fractured or otherwise likely to fail
ADVISORY
Occurrences: 455
Tyre tread depth not in accordance with the requirements
ADVISORY
Occurrences: 360
Fluid: leaking excessively and likely to harm the environment or to pose a safety risk to other road users
ADVISORY
Occurrences: 327
A tyre: with a lump, bulge or tear … or with cords exposed or damaged
ADVISORY
Occurrences: 248
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: 105
Exhaust system has a major leak or is insecure
ADVISORY
Occurrences: 92
Lamp emitted colour, position or intensity not in accordance with the requirements
ADVISORY
Occurrences: 86
A shock absorber damaged … or showing signs of severe leakage
ADVISORY
Occurrences: 78

Serious faults (Top 10)

Brake pipe damaged or excessively corroded
FAIL
Occurrences: 69
Lambda coefficient outside the default limits or the range specified by the manufacturer
FAIL
Occurrences: 55
Tyre tread depth not in accordance with the requirements
FAIL
Occurrences: 55
Beam image obviously incorrect
FAIL
Occurrences: 44
Lamp: missing, inoperative or in the case of a multiple light source more than a half not functioning
FAIL
Occurrences: 38
A transmission shaft constant velocity joint boot: missing, split, insecure or no longer prevents the ingress of dirt
FAIL
Occurrences: 34
A suspension pin, bush, joint or bearing: excessively worn
FAIL
Occurrences: 32
The aim of a headlamp is not within limits laid down in the requirements
FAIL
Occurrences: 30
Emissions levels exceed default limits
FAIL
Occurrences: 29
A headlamp: missing, inoperative or more than ½ not functioning in the case of LED
FAIL
Occurrences: 27