Mg 3 - 2021
87.4 faults per 100 tests
Year average for all cars of 2021 is 80.0 faults per 100 tests
Dataset: MOT tests in Great Britain (period: 2024-01-01 to 2025-09-10) for Mg 3, model year 2021.
Sample size: 1,985 cars, 4,258 tests and 3,722 recorded faults.
0%
More faults compared to the average car of same model year
More faults compared to the average car of same model year
Quick summary
Total: 1,985 cars
The MG 3, a 2021 model, has an overall defect rate of 87 per 100 vehicles, which is 11% higher than the average rate of 79 per 100 for cars of the same year. Notably, it shows significantly better performance in categories like visibility and body/structure, with defect rates of 10% and 1% respectively, compared to the averages of 15% and 2%. However, the model struggles with steering and lights & electrics, exhibiting higher defect rates in these areas at 1% and 22% respectively, compared to their averages of 1% and 11%. Defects tend to increase with mileage, especially in the higher mileage segments where the MG 3 shows a notable spike in issues.
Cars by mileage segment
Total: 1,985 cars
Categories
Brakes
▲ 7.3% better
37.1 faults / 100 tests
Year avg: 40.0 / 100 tests
- Brake disc or drum: insecure, fractured or otherwise likely to fail
- Brake disc or drum: significantly and obviously worn
- Parking brake efficiency: below minimum requirement
- Brake lining or pad: worn below 1.5mm
- Excessive fluctuation in brake effort through each wheel revolution
Steering
▼ 57.1% worse
1.1 faults / 100 tests
Year avg: 0.7 / 100 tests
- A steering ball joint: with excessive wear or free play
- Power steering fluid leaking or system malfunctioning
- Power steering fluid leaking or system malfunctioning
- A steering ball joint: with excessive wear or free play
- Steering box: leaking oil
Visibility
▲ 31.7% better
9.9 faults / 100 tests
Year avg: 14.5 / 100 tests
- Wiper blade: defective
- Wiper blade: missing or obviously not clearing the windscreen
- Windscreen washers not working or not providing sufficient fluid to clear the windscreen
- 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
▼ 94.6% worse
21.8 faults / 100 tests
Year avg: 11.2 / 100 tests
- A headlamp: missing, inoperative or more than ½ not functioning in the case of LED
- Stop lamp(s): all missing or inoperative
- The aim of a headlamp is not within limits laid down in the requirements
- The aim of a headlamp is not within limits laid down in the requirements
- Stop lamp(s): all missing or inoperative
Wheels & Suspension
▼ 16.2% worse
101.4 faults / 100 tests
Year avg: 87.3 / 100 tests
- A tyre: with a lump, bulge or tear … or with cords exposed or damaged
- A tyre: with a lump, bulge or tear … or with cords exposed or damaged
- A tyre: with a cut in excess of the requirements deep enough to reach the ply or cords
- Tyre tread depth not in accordance with the requirements
- A tyre: with a cut in excess of the requirements deep enough to reach the ply or cords
Body/Structure
▲ 71.4% better
0.6 faults / 100 tests
Year avg: 2.1 / 100 tests
- Exhaust system has a major leak or is insecure
- Bumper: insecure or with damage likely to cause injury when grazed or contacted
- A door will not open using the relevant control or close properly
- Fuel system: leaking, or missing or ineffective filler cap
- A body panel or body component: damaged or corroded and likely to cause injury when grazed or contacted, or insecure
Equipment
▲ 13.3% better
1.3 faults / 100 tests
Year avg: 1.5 / 100 tests
- A seat belt:
- A seat belt: or flexible stalk damaged
- Speedometer: operation impaired
- A seat belt: webbing or flexible stalk significantly stretched or weakened
- Seat belt buckle missing, damaged or not functioning as intended
Other
▲ 40.7% better
1.6 faults / 100 tests
Year avg: 2.7 / 100 tests
- Fluid: leaking excessively and likely to harm the environment or to pose a safety risk to other road users
- Fluid: leaking excessively and likely to harm the environment or to pose a safety risk to other road users
- Engine MIL inoperative or indicating a malfunction
- Engine MIL inoperative or indicating a malfunction
- Lambda coefficient outside the default limits or the range specified by the manufacturer
Fault rate by mileage segment
Model
Year average
* Metric: faults per 100 tests.
Most common faults (Top 10)
A tyre: with a lump, bulge or tear … or with cords exposed or damaged
ADVISORY
Occurrences: 963
Tyre tread depth not in accordance with the requirements
ADVISORY
Occurrences: 720
Brake disc or drum: insecure, fractured or otherwise likely to fail
ADVISORY
Occurrences: 341
Brake lining or pad: worn below 1.5mm
ADVISORY
Occurrences: 259
The aim of a headlamp is not within limits laid down in the requirements
PRS
Occurrences: 246
A tyre: with a lump, bulge or tear … or with cords exposed or damaged
FAIL
Occurrences: 123
A tyre: with a cut in excess of the requirements deep enough to reach the ply or cords
ADVISORY
Occurrences: 71
A tyre: with a cut in excess of the requirements deep enough to reach the ply or cords
FAIL
Occurrences: 61
Brake disc or drum: significantly and obviously worn
ADVISORY
Occurrences: 55
Wiper blade: defective
MINOR
Occurrences: 55
Serious faults (Top 10)
A tyre: with a lump, bulge or tear … or with cords exposed or damaged
FAIL
Occurrences: 123
A tyre: with a cut in excess of the requirements deep enough to reach the ply or cords
FAIL
Occurrences: 61
The aim of a headlamp is not within limits laid down in the requirements
FAIL
Occurrences: 43
A headlamp: missing, inoperative or more than ½ not functioning in the case of LED
FAIL
Occurrences: 39
Wiper blade: missing or obviously not clearing the windscreen
FAIL
Occurrences: 38
Tyre tread depth not in accordance with the requirements
FAIL
Occurrences: 32
Tyre pressure monitoring system malfunctioning or obviously not working
FAIL
Occurrences: 26
A spring: or spring component fractured or seriously weakened
FAIL
Occurrences: 24
Parking brake efficiency: below minimum requirement
FAIL
Occurrences: 22
Stop lamp(s): all missing or inoperative
FAIL
Occurrences: 22