Porsche BOXSTER - 1999
234.0 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 BOXSTER, model year 1999.
Sample size: 1,196 cars, 2,515 tests and 5,886 recorded faults.
0%
Less faults compared to the average car of same model year
Less faults compared to the average car of same model year
Quick summary
Total: 1,196 cars
The 1999 Porsche Boxster has an overall defect rate of 234 per 100 vehicles, which is significantly lower than the average of 345 per 100 vehicles, representing a 32% improvement. Notably, this model excels in several categories, including steering, visibility, and body structure, where it performs substantially better than average with defects in these areas being much less frequent. Mileage-related trends show that defect rates increase with higher mileage, particularly in the 124,000+ miles category, but even at this level, the Boxster maintains a better-than-average performance. Overall, the Boxster demonstrates reliability compared to its peers from the same year, especially in critical systems.
Cars by mileage segment
Total: 1,196 cars
Categories
Brakes
▲ 10.5% better
137.3 faults / 100 tests
Year avg: 153.4 / 100 tests
- Brake pipe damaged or excessively corroded
- Brake pipe damaged or excessively corroded
- Brake disc or drum: significantly and obviously worn
- Brake disc or drum: insecure, fractured or otherwise likely to fail
- Brake lining or pad: worn below 1.5mm
Steering
▲ 64.9% better
9.1 faults / 100 tests
Year avg: 25.9 / 100 tests
- A steering ball joint: with excessive wear or free play
- 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: missing or no longer prevents the ingress of dirt etc.
Visibility
▲ 42.5% better
15.3 faults / 100 tests
Year avg: 26.6 / 100 tests
- Wiper blade: missing or obviously not clearing the windscreen
- Wiper blade: defective
- 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
- Wiper blade: missing or obviously not clearing the windscreen
Lights & Electrics
▲ 30.3% better
50.9 faults / 100 tests
Year avg: 73.0 / 100 tests
- Headlamp reflector or lens: slightly defective
- Lamp: missing, inoperative or in the case of a multiple light source more than a half 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
- Product on the lens or light source which obviously reduces light intensity or changes emitted colour to other than white or yellow
- Beam image obviously incorrect
Wheels & Suspension
▲ 34.3% better
175.3 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
▲ 73.6% better
20.2 faults / 100 tests
Year avg: 76.5 / 100 tests
- Exhaust system has a major leak or is insecure
- 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
- A transmission shaft constant velocity joint boot: severely deteriorated
- Vehicle structure corroded to the extent that: the rigidity of the assembly is significantly reduced
Equipment
▲ 70.3% better
5.7 faults / 100 tests
Year avg: 19.2 / 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
- An SRS malfunction indicator lamp (MIL) indicates a system malfunction
- Audible warning:
- An SRS malfunction indicator lamp (MIL) indicates a system malfunction
- 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
▲ 3.9% better
54.3 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
* Metric: faults per 100 tests.
Most common faults (Top 10)
Brake pipe damaged or excessively corroded
ADVISORY
Occurrences: 769
A suspension pin, bush, joint or bearing: excessively worn
ADVISORY
Occurrences: 651
Tyre tread depth not in accordance with the requirements
ADVISORY
Occurrences: 487
Brake disc or drum: insecure, fractured or otherwise likely to fail
ADVISORY
Occurrences: 462
A tyre: with a lump, bulge or tear … or with cords exposed or damaged
ADVISORY
Occurrences: 421
Fluid: leaking excessively and likely to harm the environment or to pose a safety risk to other road users
ADVISORY
Occurrences: 360
Lambda coefficient outside the default limits or the range specified by the manufacturer
FAIL
Occurrences: 136
A shock absorber damaged … or showing signs of severe leakage
ADVISORY
Occurrences: 121
Exhaust system has a major leak or is insecure
ADVISORY
Occurrences: 115
A suspension component: excessively damaged or corroded
ADVISORY
Occurrences: 101
Serious faults (Top 10)
Lambda coefficient outside the default limits or the range specified by the manufacturer
FAIL
Occurrences: 136
Brake pipe damaged or excessively corroded
FAIL
Occurrences: 82
Emissions levels exceed default limits
FAIL
Occurrences: 70
A suspension pin, bush, joint or bearing: excessively worn
FAIL
Occurrences: 67
Lamp: missing, inoperative or in the case of a multiple light source more than a half not functioning
FAIL
Occurrences: 48
Beam image obviously incorrect
FAIL
Occurrences: 47
Tyre tread depth not in accordance with the requirements
FAIL
Occurrences: 40
Emissions levels exceed the manufacturer’s specified limits
FAIL
Occurrences: 39
A spring: or spring component fractured or seriously weakened
FAIL
Occurrences: 36
Wiper blade: missing or obviously not clearing the windscreen
FAIL
Occurrences: 34