Mercedes Unclassified MOT pass rate: 81.5% (2,053 tests, 2025)

The Mercedes Unclassified passed 81.5% of its 2,053 MOT tests in 2025 — 4.0 points above the UK average of 77.5%. The median tested example was 18 years old with 68,733 miles on the clock.

81.5%Pass rate (2025)

2,053MOT tests analysed

68,733 miMedian mileage at test

18 yrsMedian age at test

How the Unclassified compares

Mercedes Unclassified

81.5%

UK average (all Class 4 vehicles)

77.5% across 33.1 million tests

Mercedes average (all models)

77.1%

What fails most on the Mercedes Unclassified

Across failed and rectified tests in 2025, these vehicle systems produced the most defects on the Unclassified:

#	System	Defects recorded	Share
1	Lamps, reflectors and electrical equipment	324	30.1%
2	Brakes	285	26.4%
3	Suspension	140	13.0%
4	Body, chassis, structure	95	8.8%
5	Visibility	94	8.7%
6	Tyres	76	7.1%

Pre-MOT checklist for Unclassified owners

Based on the failure profile above, ten minutes with a torch before your test removes the most likely fail items:

Walk round with all lights on: one blown bulb is the most avoidable fail there is
Feel for a spongy pedal or pulling to one side; check pad wear through the wheel spokes if visible
Bounce each corner and listen for clonks over speed bumps — suspension is this model’s (and the UK’s) top failure system
Look underneath for corrosion around sills and subframes, especially on older cars
Replace smeared wiper blades and top up washer fluid — both are test items

Engine management light on?

An illuminated engine management light is a Major MOT defect. Read the code, repair the cause, then confirm the light stays off — clearing a code alone is not a repair.

Understand the engine management light and MOT rules →

Same-vehicle follow-up

The defect groups above are a single-year count. The prognosis registry follows the same vehicle_id into the next MOT year. The extracts do not record the repair, a turbo part number, or a gearbox type.

Brakes: advisory follow-up · did the same fail item hold
Suspension: advisory follow-up · did the same fail item hold
Body, chassis, structure: advisory follow-up · did the same fail item hold
Tyres: advisory follow-up · did the same fail item hold

Check a specific Unclassified before you buy

Pass rates describe the model; they can’t tell you about the one car you’re looking at. Run its plate through our free MOT history check to see its personal record of failures, advisories and mileage readings.

FAQs

What is the MOT pass rate for a Mercedes Unclassified?

In 2025, 81.5% of 2,053 first MOT tests on the Mercedes Unclassified were passes (UK average: 77.5%). Data: DVSA anonymised MOT results.

What does the Unclassified fail its MOT on most?

The biggest defect group is lamps, reflectors and electrical equipment (30.1% of its recorded defects), followed by brakes.

Is the Mercedes Unclassified reliable?

MOT pass rate is one lens on durability: at 81.5% it performs above the national average at a median age of 18 years and 68,733 miles. Always check the individual car's history too.

Before you agree to the work

A fault or an advisory is a quote waiting to happen. These pages set out what a garage has to tell you, what a comparable written quote should include, and what you can do if the bill is not what you agreed.

Estimates, quotes and extra work — what a price has to cover, and when a garage may charge more than it first said.
What a diagnostic test costs — what the fee should include, and when it should come off the repair.
Tools — when to buy and when to skip — how to choose a diagnostic tool, and when a garage visit is cheaper than owning one.
Choosing a garage you can check — what to verify before you hand over the keys.
Your rights after a car repair — what to do when the work is not right, and how to put it in writing.

Source: DVSA Anonymised MOT tests and results, 2025 extract (Class 4 initial tests only; retests excluded). Contains public sector information licensed under the Open Government Licence v3.0. Figures rounded to one decimal place.