Mercedes-Benz GLB common problems and MOT failures
What goes wrong on a used Mercedes-Benz GLB, year by year: known faults from UK buying guides, the parts flagged at MOT more than on other cars (from 21,332 MOTs done during 2023–2025), and what to check before you buy one.
Pick the year
Most years have their own guide. The year is when the car was first registered (it’s on the logbook, or check the reg below).
What usually goes wrong with a Mercedes-Benz GLB?
We haven’t found widely reported faults for the Mercedes-Benz GLB in the UK buying guides we use yet. That doesn’t mean it has none, so check the car carefully and look at the MOT weak spots below.
Common Mercedes-Benz GLB MOT failures to check
Parts flagged at MOT well above the usual rate for cars the same age, for each fuel on its own. From the DVSA’s results for every MOT done in Great Britain during 2023–2025.
Petrol
Brake pads
up to 1.8× usualStands out on cars registered in 2021 and 2022.
Rough price £75–£175 (one axle) ClickMechanicAt the viewing: Listen for squealing or grinding when braking, and look through the wheel at how much pad is left.
Mercedes-Benz GLB MOT pass rate by year
Of the years since 2005 with plenty of MOT tests, the 2021 Mercedes-Benz GLB did best (90% passed first time, 3 points above all 2021 cars) and the 2022 did worst (91%, 2 points above all 2022 cars). Older cars fail more, so compare each year with all cars registered the same year.
Looking at a Mercedes-Benz GLB?
Check the actual car: its own MOT history and what to ask the seller. Free, no sign-up.
Where this comes from: MOT figures are the DVSA’s anonymised results for every MOT test done in Great Britain during 2023–2025, grouped by the year each car was first registered. How many are on the road is from the Department for Transport’s vehicle licensing statistics. Known faults are from UK buying guides, in our own words, with links. How we score