MOT cost .

Mercedes Benz

G

1,014 MOT tests analysed. sits above the UK fleet average — here's where Gs pass, fail, and end up on the retest sheet.

That's 15.7 points above the UK fleet average across our 1,988 tracked models — a confident result.

Pass

91.4%

Pass-after-fix

1.1%

Fail

6.8%

Avg miles

29,092

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

The picture

G: a strong MOT record by UK norms

Across 1,014 MOT tests, the G returns 91.4% first-time pass — comfortably ahead of the UK fleet average. The single most-logged Major fail is a non-conforming number plate. Windscreen damage and a seriously damaged tyre round out the top three. Average tested mileage sits at 29,092, 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

    Number plate does not conform to the specified requirements

    22 occurrences · 2.2% of tests

  2. 02

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

    16 occurrences · 1.6% of tests

  3. 03

    A tyre seriously damaged

    14 occurrences · 1.4% of tests

  4. 04

    a brake lining or pad worn below 1.5mm

    11 occurrences · 1.1% of tests

  5. 05

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

    11 occurrences · 1.1% of tests

  6. 06

    Wiper blade defective

    10 occurrences · 1.0% of tests

  7. 07

    Tyre tread depth not in accordance with the requirements

    8 occurrences · 0.8% of tests

  8. 08

    Steering rack gaiter or ball joint dust cover damaged or deteriorated

    6 occurrences · 0.6% of tests

  9. 09

    A tyre cords visible or damaged

    6 occurrences · 0.6% of tests

  10. 10

    A tyre seriously damaged

    6 occurrences · 0.6% 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

£105–£275

If every one of this G'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 →

Try the calculator

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

MOT-spec replacement number plate

Faded or non-standard plates fail outright. Replacements take ten minutes online with V5C details.

Search Amazon UK

Item 02 · Amazon UK

Brake pad measurement gauge

Testers fail pads under 1.5mm. A wear gauge tells you if you've got two months left or two weeks.

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 G?

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 G 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.