2018 Mercedes-Benz C-Class · 110,254 MOT tests
2018 Mercedes-Benz C-Class reliability
2018 Mercedes-Benz C-Classs fail 12.7% of first MOT tests, 20% fewer MOT fails than the average car its age and mileage, ranking 10 of 25 C-Class years (110,254 DVSA tests, 2022 to 2024).
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- first-time fail rate (all Mercedes-Benz C-Classs: 24%)
- 12.7%
- first-time fail rate (all Mercedes-Benz C-Classs: 24%)
- fails than cars of the same age and mileage
- 20% fewer
- fails than cars of the same age and mileage
- typical miles at its MOT, aged about 5
- 40,585
- typical miles at its MOT, aged about 5
- MOT tests, 2022 to 2024
- 110,254
- MOT tests, 2022 to 2024
Year on year
2018 against the years either side
- 2017 cars: 21% fewer MOT fails than the average car its age (the 2018 car does worse)
- 2019 cars: 19% fewer MOT fails than the average car its age (the 2018 car does better)
- Weak spot: tyres, 6.7% of tests fail here (30% above cars of the same age and mileage).
- Strong point: lights and electrics, 64% fewer fails than comparable cars.
- 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 Mercedes-Benz C-Class
Fail rate by area
- Tyres6.7%
- Suspension1.7%
- Lights and electrics1.4%
- Exhaust, emissions and leaks1.3%
- Brakes1.3%
- Windscreen, wipers and mirrors1.2%
- Wheels0.6%
Average for cars of the same age and mileage
Top failures
Tyre tread below 1.6mm 2.26%
Tread below 1.6mm is illegal and reduces grip in wet conditions, so the tyre must be replaced.
Tyre ply or cords exposed 1.36%
Exposed ply or cords can let the tyre fail suddenly, so the tyre must be replaced before the car is driven.
Tyre cut reaching ply or cords 1.25%
A cut reaching the ply or cords weakens the tyre and can cause a burst, so it must be replaced.
Tyre bulge from structural failure 0.64%
A bulge means the tyre's structure has failed and it could burst suddenly, so it must be replaced at once.
Suspension ball joint excessively worn 0.61%
A worn ball joint can fail and cause loss of steering control, so it must be replaced promptly.
Brake pads worn below 1.5mm 0.6%
Pads worn below 1.5mm lose stopping power and can damage discs, so replacement is needed before the car is driven.
Common advisories
Tyre worn close to legal limit (13.87%) · Brake pads wearing thin (5.69%) · Tyre slightly damaged or cracking (3.2%) · Brake disc pitted or scored (2.98%) · Tyre worn close to legal limit (2.01%) · Suspension ball joint slight play (1.71%)
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 2018 Mercedes-Benz C-Class reliable?
2018 Mercedes-Benz C-Classs fail 12.7% of first MOT tests, 20% fewer MOT fails than the average car its age and mileage, ranking 10 of 25 C-Class years (110,254 DVSA tests, 2022 to 2024).
What fails on a 2018 Mercedes-Benz C-Class MOT?
Most often tyre tread below 1.6mm (2.26% of tests), tyre ply or cords exposed (1.36% of tests), tyre cut reaching ply or cords (1.25% of tests).
How many miles should a 2018 Mercedes-Benz C-Class have done?
At its MOT aged about 5, a typical 2018 Mercedes-Benz C-Class shows 40,585 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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