2021 BMW 4 Series · 4,270 MOT tests
2021 BMW 4 Series reliability
2021 BMW 4 Seriess fail 6.7% of first MOT tests, 42% fewer MOT fails than the average car its age and mileage, ranking 1 of 9 4 Series years (4,270 DVSA tests, 2022 to 2024).
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- first-time fail rate (all BMW 4 Seriess: 14.1%)
- 6.7%
- first-time fail rate (all BMW 4 Seriess: 14.1%)
- fails than cars of the same age and mileage
- 42% fewer
- fails than cars of the same age and mileage
- typical miles at its MOT, aged about 3
- 25,240
- typical miles at its MOT, aged about 3
- MOT tests, 2022 to 2024
- 4,270
- MOT tests, 2022 to 2024
Year on year
2021 against the years either side
- 2020 cars: 21% fewer MOT fails than the average car its age (the 2021 car does better)
- Weak spot: tyres, 5.1% of tests fail here (20% above cars of the same age and mileage).
- Plates: a 2021 car carries a 70 plate (January–February 2021), or a 21 plate (March–August 2021), or a 71 plate (September–December 2021).
Common problems
What fails on a 2021 BMW 4 Series
Fail rate by area
- Tyres5.1%
- Lights and electrics0.9%
- Brakes0.4%
- Windscreen, wipers and mirrors0.4%
- Number plates and VIN0.3%
- Exhaust, emissions and leaks0.2%
- Wheels0.2%
Average for cars of the same age and mileage
Top failures
Tyre bulge from structural failure 1.22%
A bulge means the tyre's structure has failed and it could burst suddenly, so it must be replaced at once.
Tyre cut reaching ply or cords 0.96%
A cut reaching the ply or cords weakens the tyre and can cause a burst, so it must be replaced.
Tyre tread below 1.6mm 0.63%
Tread below 1.6mm is illegal and reduces grip in wet conditions, so the tyre must be replaced.
Tyre ply or cords exposed 0.49%
Exposed ply or cords can let the tyre fail suddenly, so the tyre must be replaced before the car is driven.
Side repeater not working 0.21%
A failed side repeater means other road users cannot see your intended direction change, which is dangerous and must be fixed.
Headlamp aim set too high 0.21%
Headlamps aimed too high can dazzle other drivers, and adjusting them is usually a quick job.
Common advisories
Tyre worn close to legal limit (3.7%) · Brake pads wearing thin (0.8%) · Tyre has a shallow cut (0.73%) · Nail in tyre, monitor (0.49%) · Tyre worn close to legal limit (0.49%) · Tyre slightly damaged or cracking (0.44%)
Other years
Every BMW 4 Series year
The full picture: BMW 4 Series reliability. Before you pay for any BMW 4 Series, a Full Check (£9.99) shows finance, stolen and write-off records the MOT can't.
Source: DVSA anonymised MOT results, 2022 to 2024, class 4 normal tests.
Is a 2021 BMW 4 Series reliable?
2021 BMW 4 Seriess fail 6.7% of first MOT tests, 42% fewer MOT fails than the average car its age and mileage, ranking 1 of 9 4 Series years (4,270 DVSA tests, 2022 to 2024).
What fails on a 2021 BMW 4 Series MOT?
Most often tyre bulge from structural failure (1.22% of tests), tyre cut reaching ply or cords (0.96% of tests), tyre tread below 1.6mm (0.63% of tests).
How many miles should a 2021 BMW 4 Series have done?
At its MOT aged about 3, a typical 2021 BMW 4 Series shows 25,240 miles. Much higher or lower is worth asking about.
What plate is a 2021 car?
A car first registered in 2021 carries a 70 plate (January–February 2021), or a 21 plate (March–August 2021), or a 71 plate (September–December 2021).
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