MOT cost .

Mercedes Benz

230

1,109 MOT tests analysed. lands in the middle of the pack — here's where 230s pass, fail, and end up on the retest sheet.

That's 2.9 points below the UK fleet average across our 1,988 tracked models — buyers should expect more first-time fails than the typical UK car.

Pass

72.9%

Pass-after-fix

4.2%

Fail

21.7%

Avg miles

116,453

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

The picture

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

Across 1,109 MOT tests, the 230 returns 72.9% first-time pass — below the UK fleet average. The single most-logged Major fail is the strength or continuity of the load bearing. A torn suspension dust cover and a lamp out round out the top three. Average tested mileage sits at 116,453, 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

    The strength or continuity of the load bearing structure within 30cm of any sub-frame, spring or suspension component mounting (a 'prescribed area') is significantly reduced or inadequately repaired

    58 occurrences · 5.2% of tests

  2. 02

    A suspension joint dust cover severely deteriorated

    54 occurrences · 4.9% of tests

  3. 03

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

    43 occurrences · 3.9% of tests

  4. 04

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

    39 occurrences · 3.5% of tests

  5. 05

    A suspension joint dust cover missing or no longer prevents the ingress of dirt etc

    37 occurrences · 3.3% of tests

  6. 06

    Steering rack gaiter or ball joint dust cover damaged or deteriorated

    36 occurrences · 3.2% of tests

  7. 07

    A transmission shaft constant velocity joint boot severely deteriorated

    36 occurrences · 3.2% of tests

  8. 08

    Significant brake effort recorded with no brake applied indicating a binding brake

    28 occurrences · 2.5% of tests

  9. 09

    A battery insecure but not likely to fall from carrier

    27 occurrences · 2.4% of tests

  10. 10

    Brake pipe damaged or excessively corroded

    26 occurrences · 2.3% 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 2 failures

£160£480

If every one of this 230'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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Buying or keeping a 230?

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 230 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.