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Porsche 911 - 1984

83.5 faults per 100 tests
Year average for all cars of 1984 is 236.2 faults per 100 tests
Dataset: MOT tests in Great Britain (period: 2024-01-01 to 2025-09-10) for Porsche 911, model year 1984. Sample size: 237 cars, 370 tests and 309 recorded faults.
0%
Less faults compared to the average car of same model year

Quick summary

Total: 237 cars

The 1984 Porsche 911 shows a significantly lower overall defect rate compared to the average car of the same year, with 84 defects per 100 vehicles, which is 65% better than the average of 235 defects per 100 vehicles. Mileage-related trends indicate that the defect rate is highest in vehicles with fewer than 31,000 miles, but it remains considerably lower across all mileage categories compared to the average. Notably, the 911 excels in categories such as brakes and steering, showcasing a much lower incidence of defects—51% and 80% better, respectively—than the average. Additionally, it performs well in visibility and lights & electrics, suggesting a robust reliability profile in these areas. Overall, the Porsche 911 stands out for its impressive durability and lower defect rates across key categories.

Cars by mileage segment

Total: 237 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
▲ 52.1% better
38.9 faults / 100 tests
Year avg: 81.2 / 100 tests
  • Significant brake effort recorded with no brake applied indicating a binding brake
  • Parking brake efficiency: below minimum requirement
  • Brake hose ferrules: excessively corroded
  • Significant brake effort recorded with no brake applied indicating a binding brake
  • Brake hose ferrules: excessively corroded
Steering
▲ 80.0% better
5.9 faults / 100 tests
Year avg: 29.5 / 100 tests
  • A steering ball joint: with excessive wear or free play
  • A steering linkage component with: excessive movement between components or likely to become detached
  • Steering rack gaiter or ball joint dust cover: missing or no longer prevents the ingress of dirt etc.
  • Excessive radial movement between the top of the steering column and the shaft indicating an excessively worn top bearing
  • Steering rack gaiter or ball joint dust cover: damaged or deteriorated
Visibility
▲ 48.6% better
11.4 faults / 100 tests
Year avg: 22.2 / 100 tests
  • Windscreen washers not working or not providing sufficient fluid to clear the windscreen
  • Wiper blade: missing or obviously not clearing the windscreen
  • Obligatory mirror or device: slightly damaged or loose
  • Windscreen or window damaged or seriously discoloured: but not adversely affecting driver’s view
  • Windscreen washers not working or not providing sufficient fluid to clear the windscreen
Lights & Electrics
▲ 43.3% better
34.6 faults / 100 tests
Year avg: 61.0 / 100 tests
  • The aim of a headlamp is not within limits laid down in the requirements
  • 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
  • Beam image obviously incorrect
  • Product on the lens or light source which obviously reduces light intensity or changes emitted colour to other than white or yellow
Wheels & Suspension
▲ 67.9% better
50.3 faults / 100 tests
Year avg: 156.5 / 100 tests
  • Tyre tread depth not in accordance with the requirements
  • A tyre: with a lump, bulge or tear … or with cords exposed or damaged
  • A wheel bearing: with excessive play
  • A suspension pin, bush, joint or bearing: excessively worn
  • The strength or continuity of the load bearing structure within 30cm … is significantly reduced or inadequately repaired
Body/Structure
▲ 89.5% better
5.4 faults / 100 tests
Year avg: 51.3 / 100 tests
  • Exhaust system has a major leak or is insecure
  • A main load-bearing structural member: fractured or deformed such that structural rigidity 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
  • Vehicle structure corroded to the extent that: the rigidity of the assembly is significantly reduced
Equipment
▲ 76.6% better
4.9 faults / 100 tests
Year avg: 20.9 / 100 tests
  • Speedometer: operation impaired
  • 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:
  • 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
Other
▲ 68.5% better
15.7 faults / 100 tests
Year avg: 49.9 / 100 tests
  • Emissions levels exceed default limits
  • Emissions test unable to be completed
  • Fluid: leaking excessively and likely to harm the environment or to pose a safety risk to other road users
  • An induction or exhaust leak that could affect emissions levels

Fault rate by mileage segment

Model    Year average
0 500 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 wheel bearing: with excessive play
ADVISORY
Occurrences: 34
Significant brake effort recorded with no brake applied indicating a binding brake
ADVISORY
Occurrences: 24
Fluid: leaking excessively and likely to harm the environment or to pose a safety risk to other road users
ADVISORY
Occurrences: 24
Significant brake effort recorded with no brake applied indicating a binding brake
FAIL
Occurrences: 13
Windscreen washers not working or not providing sufficient fluid to clear the windscreen
FAIL
Occurrences: 13
Tyre tread depth not in accordance with the requirements
ADVISORY
Occurrences: 12
A suspension pin, bush, joint or bearing: excessively worn
ADVISORY
Occurrences: 10
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: 10
The aim of a headlamp is not within limits laid down in the requirements
FAIL
Occurrences: 10
Beam image obviously incorrect
PRS
Occurrences: 8

Serious faults (Top 10)

Windscreen washers not working or not providing sufficient fluid to clear the windscreen
FAIL
Occurrences: 13
Significant brake effort recorded with no brake applied indicating a binding brake
FAIL
Occurrences: 13
The aim of a headlamp is not within limits laid down in the requirements
FAIL
Occurrences: 10
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: 10
Parking brake efficiency: below minimum requirement
FAIL
Occurrences: 5
Beam image obviously incorrect
FAIL
Occurrences: 4
Audible warning:
FAIL
Occurrences: 4
Brake hose ferrules: excessively corroded
FAIL
Occurrences: 4
A suspension pin, bush, joint or bearing: excessively worn
FAIL
Occurrences: 4
Service brake efficiency: below minimum requirement
FAIL
Occurrences: 3