Mercedes-Benz Unclassified MOT reliability

Mercedes-Benz Unclassifieds passed their MOT first time 79% of the time across 852 tests in 2025.

First-time pass rate

79%

MOTs analysed

852

Still licensed (GB)

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Body type

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Pass rate by year of first registration

Older cars fail more often, so compare a car with others of the same age. Years with very few MOTs can show extreme pass rates, even 0% or 100%, so give more weight to years with more tests.

In detail:

First registered

2020 diesel

53 MOTs

These figures come from 53 MOT tests. That's a fairly small number of cars, so they may not be typical of these cars as a whole.

Passed first time 81%. Typical mileage 33,634 (most between 17,465 and 54,320).

2021: 67% → 2022: 64% → 2023: 83% → 2024: 78% → 2025: 81%

Most common failures

Rigid brake pipes: excessively corroded (5.7%)
Wipers: does not clear the windscreen effectively (3.8%)
Malfunction indicator lamp: inoperative or indicates a malfunction (3.8%)
Service brake performance: excessively binding (3.8%)
Brake pads: less than 1.5 mm thick (3.8%)

2020 petrol

3 MOTs

These figures come from only 3 MOT tests. With so few cars, a single pass or fail changes the percentages a lot, so treat them as a rough guide rather than a true average.

Passed first time 67%. Typical mileage 24,561 (most between 14,860 and 102,704).

2021: 93% → 2022: 0% → 2023: 80% → 2024: 80% → 2025: 67%

Most common failures

Tread depth below requirements of 1.6mm (33.3%)

Where 2020 Unclassifieds fail

Brakes

15.1%

Wheels & tyres

5.7%

Exhaust, emissions & leaks

3.8%

Visibility & wipers

3.8%

Lights & electrics

1.9%

Seat belts & other equipment

1.9%

Looking at a particular car?

See its own MOT history, mileage and red flags, compared with these figures. Free.

Based on 2025 initial MOT tests in DVSA's anonymised MOT dataset (cars and light vans). Contains public sector information licensed under the Open Government Licence v3.0. Model details: Vehicle data by VehiclesDB.