2021 Mercedes-Benz C-Class · 3,265 MOT tests
2021 Mercedes-Benz C-Class reliability
2021 Mercedes-Benz C-Classs fail 9.5% of first MOT tests, 22% fewer MOT fails than the average car its age and mileage, ranking 6 of 25 C-Class years (3,265 DVSA tests, 2022 to 2024).
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- first-time fail rate (all Mercedes-Benz C-Classs: 24%)
- 9.5%
- first-time fail rate (all Mercedes-Benz C-Classs: 24%)
- fails than cars of the same age and mileage
- 22% fewer
- fails than cars of the same age and mileage
- typical miles at its MOT, aged about 3
- 27,734
- typical miles at its MOT, aged about 3
- MOT tests, 2022 to 2024
- 3,265
- MOT tests, 2022 to 2024
Year on year
2021 against the years either side
- 2020 cars: 19% fewer MOT fails than the average car its age (the 2021 car does better)
- Weak spot: tyres, 5.8% of tests fail here (34% above cars of the same age and mileage).
- Strong point: windscreen, wipers and mirrors, 61% fewer fails than comparable cars.
- 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 Mercedes-Benz C-Class
Fail rate by area
- Tyres5.8%
- Windscreen, wipers and mirrors1.3%
- Lights and electrics1.2%
- Wheels0.8%
- Brakes0.7%
- Suspension0.5%
- Number plates and VIN0.4%
Average for cars of the same age and mileage
Top failures
Tyre tread below 1.6mm 1.23%
Tread below 1.6mm is illegal and reduces grip in wet conditions, so the tyre must be replaced.
Tyre ply or cords exposed 1.04%
Exposed ply or cords can let the tyre fail suddenly, so the tyre must be replaced before the car is driven.
Tyre bulge from structural failure 0.89%
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 0.8%
A cut reaching the ply or cords weakens the tyre and can cause a burst, so it must be replaced.
Road wheel fractured or welded defect 0.4%
A fractured wheel can fail suddenly and cause loss of control, so it must be replaced before driving.
Wiper blade not clearing windscreen 0.4%
Wipers that do not clear the windscreen reduce visibility in rain, which is a safety risk, so replace them.
Common advisories
Tyre worn close to legal limit (7.99%) · Tyre slightly damaged or cracking (2.45%) · Brake pads wearing thin (2.14%) · Tyre worn close to legal limit (0.98%) · Tyre has a shallow cut (0.98%) · Nail in tyre, monitor (0.8%)
Other years
Every Mercedes-Benz C-Class year
The full picture: Mercedes-Benz C-Class reliability. Before you pay for any Mercedes-Benz C-Class, 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 Mercedes-Benz C-Class reliable?
2021 Mercedes-Benz C-Classs fail 9.5% of first MOT tests, 22% fewer MOT fails than the average car its age and mileage, ranking 6 of 25 C-Class years (3,265 DVSA tests, 2022 to 2024).
What fails on a 2021 Mercedes-Benz C-Class MOT?
Most often tyre tread below 1.6mm (1.23% of tests), tyre ply or cords exposed (1.04% of tests), tyre bulge from structural failure (0.89% of tests).
How many miles should a 2021 Mercedes-Benz C-Class have done?
At its MOT aged about 3, a typical 2021 Mercedes-Benz C-Class shows 27,734 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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