2022 Mercedes-Benz GLS 400 Night ED Exec D 4MAT A: common problems and what to check
What gets flagged at MOT on 2022 Mercedes-Benz GLS 400 Night ED Exec D 4MAT As, from 281 tests in 2025, plus known faults and what to look at before you buy one.
Small sample: only 281 of these were MOT tested in 2025, so treat the percentages as rough. The known faults below don't depend on it.
What gets flagged at MOT
The share of 2022 Mercedes-Benz GLS 400 Night ED Exec D 4MAT A MOT tests where testers flagged each area, as a fail or an advisory. Rough prices are typical independent-garage costs.
- Tyres25% 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.
- Suspension8% 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.
- Brakes7% 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.
- Wipers, windscreen and mirrors4% of testsRough price £15–£250
At the viewing: Check for chips in the driver's view, and test the wipers and washers.
- Seats and seatbelts3% of testsRough price £80–£250
At the viewing: Pull each seatbelt sharply. It should lock, and retract cleanly.
- Steering2% of testsRough price £100–£450
At the viewing: On a straight road the steering wheel should sit straight. Feel for play or knocking when turning.
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Where this comes from: the DVSA's anonymised results for every MOT test in Great Britain in 2025, counting tests of 2022 Mercedes-Benz GLS 400 Night ED Exec D 4MAT As registered in 2022. "Flagged" includes advisories, so it isn't the same as a fail rate. How we score