2018 MG 3 · 8,698 MOT tests
2018 MG 3 reliability
2018 MG 3s fail 21.1% of first MOT tests, 58% more MOT fails than the average car its age and mileage, ranking 6 of 7 3 years (8,698 DVSA tests, 2022 to 2024).
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- first-time fail rate (all MG 3s: 23.4%)
- 21.1%
- first-time fail rate (all MG 3s: 23.4%)
- fails than cars of the same age and mileage
- 58% more
- fails than cars of the same age and mileage
- typical miles at its MOT, aged about 5
- 27,845
- typical miles at its MOT, aged about 5
- MOT tests, 2022 to 2024
- 8,698
- MOT tests, 2022 to 2024
Year on year
2018 against the years either side
- 2017 cars: 59% more MOT fails than the average car its age (the 2018 car does better)
- 2019 cars: 48% more MOT fails than the average car its age (the 2018 car does worse)
- Weak spot: seat belts and airbags, 1.8% of tests fail here (538% above cars of the same age and mileage).
- Plates: a 2018 car carries a 67 plate (January–February 2018), or a 18 plate (March–August 2018), or a 68 plate (September–December 2018).
Common problems
What fails on a 2018 MG 3
Fail rate by area
- Tyres7%
- Lights and electrics5.8%
- Brakes5.6%
- Windscreen, wipers and mirrors3.5%
- Suspension3%
- Seat belts and airbags1.8%
- Exhaust, emissions and leaks0.8%
Average for cars of the same age and mileage
Top failures
Headlamp aim set too low 2.38%
Headlamps aimed too low light the road poorly and reduce the driver's view ahead, especially at night.
Tyre ply or cords exposed 1.84%
Exposed ply or cords can let the tyre fail suddenly, so the tyre must be replaced before the car is driven.
Coil spring fractured or broken 1.68%
A broken coil spring can leave the car sitting low or unstable, so it must be replaced before driving.
Tyre tread below 1.6mm 1.67%
Tread below 1.6mm is illegal and reduces grip in wet conditions, so the tyre must be replaced.
Wiper blade not clearing windscreen 1.45%
Wipers that do not clear the windscreen reduce visibility in rain, which is a safety risk, so replace them.
Airbag warning lamp shows fault 1.24%
A lit airbag warning means the airbag system may not deploy in a crash, so it needs diagnosing and repairing.
Common advisories
Tyre worn close to legal limit (14.26%) · Brake disc pitted or scored (8.46%) · Brake pads wearing thin (5.42%) · Tyre slightly damaged or cracking (5.39%) · Nail in tyre, monitor (2.26%) · Child seat limits belt inspection (1.89%)
Is a 2018 MG 3 reliable?
2018 MG 3s fail 21.1% of first MOT tests, 58% more MOT fails than the average car its age and mileage, ranking 6 of 7 3 years (8,698 DVSA tests, 2022 to 2024).
What fails on a 2018 MG 3 MOT?
Most often headlamp aim set too low (2.38% of tests), tyre ply or cords exposed (1.84% of tests), coil spring fractured or broken (1.68% of tests).
How many miles should a 2018 MG 3 have done?
At its MOT aged about 5, a typical 2018 MG 3 shows 27,845 miles. Much higher or lower is worth asking about.
What plate is a 2018 car?
A car first registered in 2018 carries a 67 plate (January–February 2018), or a 18 plate (March–August 2018), or a 68 plate (September–December 2018).
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