MOT cost .

Mercedes

Unclassified

2,737 MOT tests analysed. lands in the middle of the pack — here's where Unclassifieds pass, fail, and end up on the retest sheet.

That's in line with the UK fleet average across our 1,988 tracked models.

Pass

75.8%

Pass-after-fix

3.8%

Fail

18.5%

Avg miles

110,530

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

The picture

Unclassified: middle-of-the-pack on first-time pass

Across 2,737 MOT tests, the Unclassified returns 75.8% first-time pass — roughly in line with the UK fleet average. The single most-logged Major fail is windscreen damage. A number-plate lamp out and wipers that don't clear the screen round out the top three. Average tested mileage sits at 110,530, 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

    75 occurrences · 2.7% of tests

  2. 02

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

    69 occurrences · 2.5% of tests

  3. 03

    Wiper blade missing or obviously not clearing the windscreen

    67 occurrences · 2.4% of tests

  4. 04

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

    67 occurrences · 2.4% of tests

  5. 05

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

    65 occurrences · 2.4% of tests

  6. 06

    Parking brake efficiency below minimum requirement

    64 occurrences · 2.3% of tests

  7. 07

    Brake pipe damaged or excessively corroded

    52 occurrences · 1.9% of tests

  8. 08

    Steering rack gaiter or ball joint dust cover damaged or deteriorated

    48 occurrences · 1.8% of tests

  9. 09

    Headlamp reflector or lens slightly defective

    43 occurrences · 1.6% of tests

  10. 10

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

    43 occurrences · 1.6% 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

£38–£160

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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Build your own retest budget.

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.

Item 01 · Amazon UK

H7 / W21W bulb pack

A spare-bulb kit lives in the boot. Test morning is not the time to find your stop-lamp's gone.

Search Amazon UK

Item 02 · Amazon UK

Bosch Aerotwin wiper blades

Cheap wipers fail the test on smear streaks. Bosch Aerotwins last a winter and clear a screen properly.

Search Amazon UK

Item 03 · Amazon UK

Headlight restoration kit

Yellowed lenses fail the light-output test. A restoration kit lifts the haze in an afternoon for £20.

Search Amazon UK

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.