MOT cost .
BMW I8
MOT 2023
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BMW

I8

2,472 MOT tests analysed. sits above the UK fleet average — here's where I8s pass, fail, and end up on the retest sheet.

That's 14.7 points above the UK fleet average across our 1,988 tracked models — a confident result.

Pass

90.4%

Pass-after-fix

1.1%

Fail

8.1%

Avg miles

34,806

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

The picture

I8: a strong MOT record by UK norms

Across 2,472 MOT tests, the I8 returns 90.4% first-time pass — comfortably ahead of the UK fleet average. The single most-logged Major fail is tyre tread under the limit. A split CV-joint boot and a non-conforming number plate round out the top three. Average tested mileage sits at 34,806, 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

    Tyre tread depth not in accordance with the requirements

    133 occurrences · 5.4% of tests

  2. 02

    A transmission shaft constant velocity joint boot severely deteriorated

    57 occurrences · 2.3% of tests

  3. 03

    Number plate does not conform to the specified requirements

    31 occurrences · 1.3% of tests

  4. 04

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

    30 occurrences · 1.2% of tests

  5. 05

    Wiper blade defective

    30 occurrences · 1.2% of tests

  6. 06

    A tyre seriously damaged

    16 occurrences · 0.6% of tests

  7. 07

    A transmission shaft constant velocity joint boot missing or no longer prevents the ingress of dirt etc

    16 occurrences · 0.6% of tests

  8. 08

    Wiper blade missing or obviously not clearing the windscreen

    15 occurrences · 0.6% of tests

  9. 09

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

    14 occurrences · 0.6% of tests

  10. 10

    Engine MIL illuminated indicating a malfunction

    11 occurrences · 0.4% 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

£95–£175

If every one of this I8'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

Digital tyre-tread depth gauge

Five quid for a gauge beats £150 for a retest. UK MOT minimum is 1.6mm — most testers fail anything below 2mm to be safe.

Search Amazon UK

Item 02 · 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 03 · 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

Buying or keeping a I8?

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 I8 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.