MOT cost .

Mercedes Benz

Unclassified

860 MOT tests analysed. sits above the UK fleet average — here's where Unclassifieds pass, fail, and end up on the retest sheet.

That's 5.9 points above the UK fleet average across our 1,988 tracked models — a confident result.

Pass

81.6%

Pass-after-fix

2.9%

Fail

14.4%

Avg miles

81,649

Pass + Pass-after-fix + Fail = 100%

The picture

Unclassified: above-average pass rates, with caveats

Across 860 MOT tests, the Unclassified returns 81.6% first-time pass — above the UK fleet average. The single most-logged Major fail is windscreen damage. A corroded brake pipe and a number-plate lamp out round out the top three. Average tested mileage sits at 81,649, which is the lens to read those failure rankings through. If you own one and the next test is close, the ranked list below is a sensible pre-test checklist.

Top ten reasons for rejection.

  1. 01

    Windscreen or window damaged or seriously discoloured but not adversely affecting driver's view

    38 occurrences · 4.4% of tests

  2. 02

    Brake pipe damaged or excessively corroded

    19 occurrences · 2.2% of tests

  3. 03

    A rear registration plate lamp or light source missing or inoperative in the case of multiple lamps or light sources

    14 occurrences · 1.6% of tests

  4. 04

    A lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning

    13 occurrences · 1.5% of tests

  5. 05

    A tyre cords visible or damaged

    11 occurrences · 1.3% of tests

  6. 06

    The aim of a headlamp is not within limits laid down in the requirements

    11 occurrences · 1.3% of tests

  7. 07

    Parking brake efficiency below minimum requirement

    10 occurrences · 1.2% of tests

  8. 08

    Parking brake efficiency less than 50% of the required value

    10 occurrences · 1.2% of tests

  9. 09

    A tyre seriously damaged

    10 occurrences · 1.2% of tests

  10. 10

    Tyre tread depth not in accordance with the requirements

    10 occurrences · 1.2% of tests

Counts cover Major and Dangerous defects logged at test. Advisory items excluded so this shows why a car was rejected, not just what the tester flagged in passing.

Worst-case fix budget · top 3 failures

£108£220

If every one of this Unclassified's most-logged Major fails hit at the same MOT, that's the real-world UK garage range. Reality is usually one or two items, not all of them. Open the estimator →

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Tools that pre-empt a retest.

Picked against this car's top failure patterns. Affiliate links to Amazon UK — we earn a small cut at no cost to you. Disclosed up-front, doesn't shape the data.

Buying or keeping a Unclassified?

Use the failure ranking as a pre-test checklist or a haggling lever. Treat the headline pass rate as a fleet-wide trend, not a guarantee on any individual car.

If you own a Unclassified and your last MOT looked nothing like the ranked failures above, that's normal — individual cars vary widely. The ranking shows the patterns testers flag most often across the country.