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Porsche 911 - 1989

85.0 faults per 100 tests
Year average for all cars of 1989 is 252.8 faults per 100 tests
Dataset: MOT tests in Great Britain (period: 2024-01-01 to 2025-09-10) for Porsche 911, model year 1989. Sample size: 656 cars, 1,156 tests and 983 recorded faults.
0%
Less faults compared to the average car of same model year

Quick summary

Total: 656 cars

The 1989 Porsche 911 has a significantly lower overall defect rate compared to the average car of the same year, with 85 defects per 100 vehicles compared to 249. This represents a remarkable 66% improvement. Notably, the model excels in categories such as brakes and steering, where it shows defect rates of 29% and 2% respectively, far below the averages of 97% and 26%. Mileage trends indicate that defect rates increase with distance, peaking at 328 defects per 100 for vehicles with 93,000 to 124,000 miles. Overall, the Porsche 911 demonstrates strong performance in reliability against its peers.

Cars by mileage segment

Total: 656 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
▲ 69.9% better
29.2 faults / 100 tests
Year avg: 97.1 / 100 tests
  • Brake disc or drum: insecure, fractured or otherwise likely to fail
  • Significant brake effort recorded with no brake applied indicating a binding brake
  • Brake lining or pad: worn below 1.5mm
  • Brake hose ferrules: excessively corroded
  • Significant brake effort recorded with no brake applied indicating a binding brake
Steering
▲ 92.7% better
1.9 faults / 100 tests
Year avg: 26.1 / 100 tests
  • Excessive radial movement between the top of the steering column and the shaft indicating an excessively worn top bearing
  • Power steering fluid leaking or system malfunctioning
  • Steering rack gaiter or ball joint dust cover: damaged or deteriorated
  • Free play in the steering, measured at the rim of the steering wheel is: excessive
  • Excessive radial movement between the top of the steering column and the shaft indicating an excessively worn top bearing
Visibility
▲ 36.4% better
14.0 faults / 100 tests
Year avg: 22.0 / 100 tests
  • Windscreen washers not working or not providing sufficient fluid to clear the windscreen
  • Wiper blade: defective
  • Wiper blade: missing or obviously not clearing the windscreen
  • Windscreen or window damaged or seriously discoloured: but not adversely affecting driver’s view
  • Wiper blade: missing or obviously not clearing the windscreen
Lights & Electrics
▲ 51.8% better
29.6 faults / 100 tests
Year avg: 61.4 / 100 tests
  • The aim of a headlamp is not within limits laid down in the requirements
  • 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
  • A rear registration plate lamp or light source missing or inoperative: when rear registration plate has 2 or more lamps or light sources
  • The aim of a headlamp is not within limits laid down in the requirements
  • A headlamp: missing, inoperative or more than ½ not functioning in the case of LED
Wheels & Suspension
▲ 60.8% better
64.9 faults / 100 tests
Year avg: 165.6 / 100 tests
  • Tyre tread depth not in accordance with the requirements
  • A suspension pin, bush, joint or bearing: excessively worn
  • A tyre: with a lump, bulge or tear … or with cords exposed or damaged
  • A wheel bearing: with excessive play
  • A shock absorber damaged … or showing signs of severe leakage
Body/Structure
▲ 86.9% better
8.1 faults / 100 tests
Year avg: 61.7 / 100 tests
  • A transmission shaft constant velocity joint boot: severely deteriorated
  • Exhaust system has a major leak or is insecure
  • Fuel system: leaking, or missing or ineffective filler cap
  • A transmission shaft constant velocity joint boot: missing, split, insecure or no longer prevents the ingress of dirt
  • Body, cab or chassis: excessively corroded at mounting points
Equipment
▲ 81.1% better
3.5 faults / 100 tests
Year avg: 18.5 / 100 tests
  • is significantly reduced or The strength or continuity of the load bearing structure within 30cm of any seat belt anchorage (a ’prescribed area’): inadequately repaired
  • Audible warning:
  • A seat belt:
  • is significantly reduced or The strength or continuity of the load bearing structure within 30cm of any seat belt anchorage (a ’prescribed area’): inadequately repaired
  • A seat belt:
Other
▲ 64.4% better
18.9 faults / 100 tests
Year avg: 53.1 / 100 tests
  • Emissions levels exceed default limits
  • Lambda coefficient outside the default limits or the range specified by the manufacturer
  • Fluid: leaking excessively and likely to harm the environment or to pose a safety risk to other road users
  • Emissions test unable to be completed
  • Exhaust emits dense blue or clearly visible black smoke for a continuous period of 5 seconds at idle

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)

Tyre tread depth not in accordance with the requirements
ADVISORY
Occurrences: 115
Fluid: leaking excessively and likely to harm the environment or to pose a safety risk to other road users
ADVISORY
Occurrences: 85
A suspension pin, bush, joint or bearing: excessively worn
ADVISORY
Occurrences: 45
A wheel bearing: with excessive play
ADVISORY
Occurrences: 45
A shock absorber damaged … or showing signs of severe leakage
ADVISORY
Occurrences: 43
Brake disc or drum: insecure, fractured or otherwise likely to fail
ADVISORY
Occurrences: 38
Windscreen washers not working or not providing sufficient fluid to clear the windscreen
FAIL
Occurrences: 35
Brake hose ferrules: excessively corroded
ADVISORY
Occurrences: 34
A tyre: with a lump, bulge or tear … or with cords exposed or damaged
ADVISORY
Occurrences: 34
Significant brake effort recorded with no brake applied indicating a binding brake
ADVISORY
Occurrences: 33

Serious faults (Top 10)

Windscreen washers not working or not providing sufficient fluid to clear the windscreen
FAIL
Occurrences: 35
The aim of a headlamp is not within limits laid down in the requirements
FAIL
Occurrences: 27
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: 16
Emissions levels exceed default limits
FAIL
Occurrences: 15
A headlamp: missing, inoperative or more than ½ not functioning in the case of LED
FAIL
Occurrences: 14
Significant brake effort recorded with no brake applied indicating a binding brake
FAIL
Occurrences: 13
A transmission shaft constant velocity joint boot: missing, split, insecure or no longer prevents the ingress of dirt
FAIL
Occurrences: 13
Lamp: missing, inoperative or in the case of a multiple light source more than a half not functioning
FAIL
Occurrences: 11
Beam image obviously incorrect
FAIL
Occurrences: 10
Wiper blade: missing or obviously not clearing the windscreen
FAIL
Occurrences: 8