Used car guide

2020 Mercedes-Benz EQC 400 AMG Line Premium + 4M: common problems and what to check

What gets flagged at MOT on 2020 Mercedes-Benz EQC 400 AMG Line Premium + 4Ms, from 625 tests in 2025, plus known faults and what to look at before you buy one.

625MOT tests in 2025
84%pass first time (all 2020 cars: 86%)
8,300typical miles a year
19.5×the usual rate for ball joint

What stands out

Parts flagged at MOT more often on 2020 Mercedes-Benz EQC 400 AMG Line Premium + 4Ms than on all cars registered in 2020.

  • Ball joint19.5× usual
    Mercedes-Benz EQC 400 AMG Line Premium + 4M
    11.7% All 2020 cars
    0.6%

    Failed outright at MOT: 4.5%, 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: 4% here, against 9% of all 2020 cars.

By area

The share of 2020 Mercedes-Benz EQC 400 AMG Line Premium + 4M MOT tests where testers flagged each area, as a fail or an advisory. Rough prices are typical independent-garage costs.

  • Tyres
    32% 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
    13% 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
    5% of testsRough price £15–£250

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

  • Brakes
    5% 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.

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

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

  • 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
20222,378Tyres 34%
20211,412Tyres 30%

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 Line Premium + 4Ms registered in 2020. "Flagged" includes advisories, so it isn't the same as a fail rate. How we score