Ford SIERRA - 1991
119.9 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 Ford SIERRA, model year 1991.
Sample size: 417 cars, 697 tests and 836 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: 417 cars
The 1991 Ford Sierra demonstrates a significantly lower overall defect rate compared to the average car of the same year, with 120 defects per 100 vehicles versus the average of 263. Notably, the Sierra shows particularly strong performance in categories such as brakes and steering, with defect rates markedly lower than the average, suggesting better reliability in these areas. However, as mileage increases, the defect rate for the Sierra rises, especially in the 62,000 to 93,000 miles range, though it still remains below the average across all mileage segments. Overall, this model stands out for its reliability, particularly in critical safety categories.
Cars by mileage segment
Total: 417 cars
More model years for Ford SIERRA
Other models from Ford
Categories
Brakes
▲ 55.5% better
46.8 faults / 100 tests
Year avg: 105.2 / 100 tests
- Brake pipe damaged or excessively corroded
- Brake hose ferrules: excessively corroded
- Brake pipe damaged or excessively corroded
- Brake disc or drum: insecure, fractured or otherwise likely to fail
- Flexible brake hose: excessively damaged, deteriorated, chafed, twisted or stretched
Steering
▲ 72.4% better
8.0 faults / 100 tests
Year avg: 29.0 / 100 tests
- Steering rack gaiter or ball joint dust cover: damaged or deteriorated
- A steering ball joint: with excessive wear or free play
- Excessive movement of centre of steering wheel up or down
- Excessive radial movement between the top of the steering column and the shaft indicating an excessively worn top bearing
- Free play in the steering, measured at the rim of the steering wheel is: excessive
Visibility
▲ 55.2% better
9.5 faults / 100 tests
Year avg: 21.2 / 100 tests
- 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
- Obligatory mirror or device: slightly damaged or loose
- Wiper blade: missing or obviously not clearing the windscreen
- Windscreen washers not working or not providing sufficient fluid to clear the windscreen
Lights & Electrics
▲ 52.3% better
28.4 faults / 100 tests
Year avg: 59.5 / 100 tests
- A direction indicator: lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning
- A battery insecure: but not likely to fall from carrier
- Headlamp reflector or lens: slightly defective
- Beam image obviously incorrect
- A headlamp: missing, inoperative or more than ½ not functioning in the case of LED
Wheels & Suspension
▲ 54.5% better
80.3 faults / 100 tests
Year avg: 176.5 / 100 tests
- The strength or continuity of the load bearing structure within 30cm … is significantly reduced or inadequately repaired
- A spring: or spring component fractured or seriously weakened
- A suspension pin, bush, joint or bearing: excessively worn
- Tyre tread depth not in accordance with the requirements
- A tyre: with a lump, bulge or tear … or with cords exposed or damaged
Body/Structure
▲ 55.7% better
28.4 faults / 100 tests
Year avg: 64.1 / 100 tests
- A transmission shaft constant velocity joint boot: severely deteriorated
- 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
- Body, cab or chassis: excessively corroded at mounting points
Equipment
▲ 34.2% better
12.1 faults / 100 tests
Year avg: 18.4 / 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
- A seat belt: webbing or flexible stalk significantly stretched or weakened
- 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
- Seat belt not functioning as intended or of an incorrect type
Other
▲ 50.1% better
26.4 faults / 100 tests
Year avg: 52.9 / 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
- Fluid: leaking continuously and likely to pose a serious risk to road safety
- Fluid: leaking excessively and likely to harm the environment or to pose a safety risk to other road users
Fault rate by mileage segment
Model
Year average
* Metric: faults per 100 tests.
Most common faults (Top 10)
A suspension pin, bush, joint or bearing: excessively worn
ADVISORY
Occurrences: 84
Fluid: leaking excessively and likely to harm the environment or to pose a safety risk to other road users
ADVISORY
Occurrences: 66
The strength or continuity of the load bearing structure within 30cm … is significantly reduced or inadequately repaired
ADVISORY
Occurrences: 43
Brake pipe damaged or excessively corroded
ADVISORY
Occurrences: 37
Brake disc or drum: insecure, fractured or otherwise likely to fail
ADVISORY
Occurrences: 36
Brake hose ferrules: excessively corroded
ADVISORY
Occurrences: 27
Tyre tread depth not in accordance with the requirements
ADVISORY
Occurrences: 26
A spring: or spring component fractured or seriously weakened
ADVISORY
Occurrences: 25
A transmission shaft constant velocity joint boot: severely deteriorated
MINOR
Occurrences: 22
Vehicle structure corroded to the extent that: the rigidity of the assembly is significantly reduced
ADVISORY
Occurrences: 21
Serious faults (Top 10)
Emissions levels exceed default limits
FAIL
Occurrences: 17
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
FAIL
Occurrences: 14
The strength or continuity of the load bearing structure within 30cm … is significantly reduced or inadequately repaired
FAIL
Occurrences: 11
A direction indicator: lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning
FAIL
Occurrences: 9
Brake pipe damaged or excessively corroded
FAIL
Occurrences: 8
Beam image obviously incorrect
FAIL
Occurrences: 8
A headlamp: missing, inoperative or more than ½ not functioning in the case of LED
FAIL
Occurrences: 7
A transmission shaft constant velocity joint boot: missing, split, insecure or no longer prevents the ingress of dirt
FAIL
Occurrences: 6
A tyre: with a lump, bulge or tear … or with cords exposed or damaged
FAIL
Occurrences: 6
Vehicle structure corroded to the extent that: the rigidity of the assembly is significantly reduced
FAIL
Occurrences: 5