Mercedes-Benz GLB 2022: reliability & common MOT faults

At a glance

How 4,849 first tests went in 2025.

Passed first time: 91 in every 100
Did not pass first time: 9 in every 100440 failed first-attempt tests
The typical car: 3 yearsabout 26,218 miles
First tests counted: 4,849

What failed most often

Tyre condition (front)21 in every 100 failed tests
Brake pads (front)12 in every 100 failed tests

How we count this. Data: UK MOT open data, 2025. Only Class 4 cars on their first MOT of the year are counted. A car that fails and is fixed at the test station still counts as a fail in the first-attempt rate. These are raw results, not adjusted for age, mileage, or peer mix. The MOT does not test engine or gearbox internals.

Note:

These are patterns across 2022 Mercedes-Benz GLB vehicles in 2025, not a prediction that any one car will have them. Faults are grouped by part of the car. A wear pattern follows age and use more than the way the car was built. They come from MOT defect codes, not manufacturer bulletins, recalls or a diagnosis of any one car.

Brakes

One wear pattern: brake pads (front), 2.7 times as often as on similar cars.

Figures below are measured across the 440 failed first attempts in 2025 that had a mileage recorded, which allows a like-for-like comparison.

We only list faults with at least 20 failures and a rate of about 2.0 times that of similar cars, which keeps one-off results out of the list.

Brake pads (front)

Failed on 51 first tests2.7 times as often as similar carsWear pattern

What it means

A pad worn down to its wear indicator, or contaminated with oil or grease, is Major. A pad worn below the set thickness limit, missing or incorrectly mounted is Dangerous. The manual treats an illuminated brake wear indicator as no reason for failure, although DVSA also lists an illuminated indicator as a Major row.

Data: UK MOT open data, 2025. Compared with cars of the same age and mileage.

MOT pass rates

How first tests ended, and how the pass rates are counted.

Passed first time: 91in every 100; Passed on the first test.
Fixed at the station: 2in every 100; Failed, then fixed at the test station the same day.
Failed: 7in every 100; Did not pass, and were not fixed at the test station.

First-attempt pass 90.9% of 4,849 first tests (2025): only cars that passed first time count. Official-style pass 92.7%: cars fixed at the test station also count as a pass. The 2 fixed and the 7 not fixed make the 9 in every 100 that did not pass first time.

Petrol and diesel

First testsTypical mileagePassed first time, as testedPassed first time, same mileage

Petrol3,91725,582 miles9191

Diesel93228,480 miles9091

Figures are in every 100 first tests. Cars with more miles usually fail more often, so the same-mileage figure gives every fuel the mileage mix of all the cars in this year.

Same model, other years

Passed first time in every 100, all tested in 2025.

Year	Passed first time	First tests
2020	88 in every 100	2,465
2021	89 in every 100	3,800
2022 This car	91 in every 100	4,849

Newer cars are younger, so look for a jump rather than the climb.

If you are buying one

What this year's MOT record means for the decision in front of you.

Mileage makes a modest difference on a 2022 Mercedes-Benz GLB.

Of 2022 Mercedes-Benz GLB vehicles with under 18,000 miles, 94 in every 100 passed their 2025 MOT first time. With 37,000 miles or more, 87 in every 100 did.

Under 18,000988 tests

94

18,000–24,0001,048 tests

92

24,000–29,000 Typical car867 tests

92

29,000–37,0001,005 tests

89

37,000 and over941 tests

87

What to check at your mileage

How often each fault turned up on a failed first test, by the car's mileage. Read it as: what is likely to need looking at on a car like the one in front of you.

	Under 18,000	24,000–29,000	37,000 and over
Tyre condition (front)	0.9	2.2	2.3
Brake pads (front)	0.1	0.8	1.7

Faults per 100 first tests, by the car's mileage at the test.

When a car fails

65in every 100

of failed cars had one item to fix.

8in every 100

of failed cars had three or more items to fix.

3in every 100

of all first tests had a defect the tester marked dangerous (unsafe to drive away).

Every figure here is a first-attempt MOT rate from DVSA open data for this model line, for cars of this model year tested in 2025. Each mileage band holds a fifth of the tests. MOTs do not test engine or gearbox internals, so this is a pre-purchase checklist, not a full reliability score.

FAQs

Short answers about how to read this model-year guide.

Is the 2022 Mercedes-Benz GLB reliable?

The 2022 Mercedes-Benz GLB follows the pattern of the model years either side. Its main cause of failure was Tyre condition (front), about 21 in every 100 failed tests. In 2025, 90.9% of 4,849 first MOTs on the 2022 Mercedes-Benz GLB passed first time (PRS: items fixed at the station the same day, counted as a fail). The official-style rate including PRS is 92.7%. Among 440 failed first-attempt MOT tests (test year 2025), we highlight MOT failure patterns that show up more often than on cars of a similar age and mileage when the sample is large enough to trust. There is no single reliability score here; this is a pre-purchase checklist built from DVSA open data, not a guarantee for any individual car.

What is most likely to fail on a 2022 Mercedes-Benz GLB?

Ranked by how often they were actually recorded, the items that most often failed a 2022 Mercedes-Benz GLB at the first attempt were Tyre condition (front) (20.7%) and Brake pads (front) (11.6%), each as a share of the year's failed first attempts. That is what goes wrong most often on the car. The common faults table shows a different measure: faults that are unusual compared with similar cars.

What does this Mercedes-Benz GLB 2022 MOT report cover?

This page highlights MOT failure patterns for the 2022 Mercedes-Benz GLB (registration year) using UK DVSA open data for the selected test year. Patterns are compared with cars of a similar age and mileage. It is a buyer checklist from MOT defect statistics, not a full service history or manufacturer service-bulletin list.

Does this include engine and gearbox problems?

No. MOT tests do not cover engine internals, gearboxes, or many electronic modules. Patterns here come from MOT defect statistics only and should not be read as engine or gearbox reliability scores.

About this data

How this page is built and what it can (and can't) say.

These figures come from UK MOT open data for this model year. We surface common failure patterns against similar cars, not a full reliability score, and not a pass/fail verdict on any individual vehicle.

2024 2025

What we include

UK Class 4 cars only. Normal MOT tests (not retests); first test per vehicle per calendar year; results pass, PRS, or fail.

Same-day repairs

PRS means the car failed items that were fixed at the test station and then passed the same day. We count PRS as a first-attempt fail in headline rates so same-day repairs do not hide problems.

How we compare

We compare this model year with other Class 4 cars of similar age and mileage in the same test year. This model family is left out of the peer group so the car is not measured against itself.

What this does not cover

MOTs do not cover engine internals, gearboxes, or many electronics; this is not a full reliability score.
Common faults come from MOT defect stats, not manufacturer TSBs or recalls.
Age and mileage matching reduces, but does not remove, differences in how cars were used and maintained.
If the data for a car is too thin to say anything useful, we say so rather than guess.

Contains public sector information licensed under the Open Government Licence v3.0.