Used car guide

2020 Mercedes-Benz EQC 400 AMG Line: common problems and what to check

What gets flagged at MOT on 2020 Mercedes-Benz EQC 400 AMG Lines, from 2,627 tests in 2025, plus known faults and what to look at before you buy one.

2,627MOT tests in 2025
84%pass first time (all 2020 cars: 86%)
9,000typical miles a year
1.7×the usual rate for tread depth

What stands out

Parts flagged at MOT more often on 2020 Mercedes-Benz EQC 400 AMG Lines than on all cars registered in 2020.

  • Tread depth1.7× usual
    Mercedes-Benz EQC 400 AMG Line
    26.7% All 2020 cars
    16%

    Failed outright at MOT: 0.7%, against 1.5% of all 2020 cars. The rest were advisories or minor defects.

    Rough price £70–£150 our estimate

    At the viewing: Check the tread on all four tyres, including the inside edges, and look for cracks or bulges.

  • Ball joint17.5× usual
    Mercedes-Benz EQC 400 AMG Line
    10.5% All 2020 cars
    0.6%

    Failed outright at MOT: 3.8%, against 0.2% of all 2020 cars. The rest were advisories or minor defects.

    Rough price £60–£150 (one joint) ClickMechanic

    At the viewing: Listen for knocking over bumps and check the rubber boots behind the wheels aren't split.

Better than most

Brake discs: 3.1% here, against 9% of all 2020 cars.

By area

The share of 2020 Mercedes-Benz EQC 400 AMG Line MOT tests where testers flagged each area, as a fail or an advisory. Rough prices are typical independent-garage costs.

  • Tyres
    35% of testsRough price £70–£150

    At the viewing: Check the tread on all four tyres, including the inside edges, and look for cracks or bulges.

  • Suspension
    11% of testsRough price £120–£400

    At the viewing: Listen for knocks over speed bumps, and look behind each front wheel for a snapped coil spring.

  • Wipers, windscreen and mirrors
    4% of testsRough price £15–£250

    At the viewing: Check for chips in the driver's view, and test the wipers and washers.

  • Seats and seatbelts
    4% of testsRough price £80–£250

    At the viewing: Pull each seatbelt sharply. It should lock, and retract cleanly.

  • Brakes
    4% of testsRough price £150–£350

    At the viewing: Look for a lip on the disc edges and feel for judder or pulling when braking firmly from about 40mph.

  • Lights and electrics
    2% of testsRough price £10–£80

    At the viewing: Ask a friend to check every light, including brake lights and indicators, while you operate them.

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Other years

YearMOT testsMost flagged
2023173Tyres 31%
20225,018Tyres 36%
20213,809Tyres 31%

Where this comes from: the DVSA's anonymised results for every MOT test in Great Britain in 2025, counting tests of 2020 Mercedes-Benz EQC 400 AMG Lines registered in 2020. "Flagged" includes advisories, so it isn't the same as a fail rate. How we score