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790 Duke 18

582 MOT tests analysed. sits above the UK fleet average — here's where 790 Duke 18s pass, fail, and end up on the retest sheet.

That's 13.1 points above the UK fleet average across our 1,988 tracked models — a confident result.

Pass

88.8%

Pass-after-fix

5.5%

Fail

5.5%

Avg miles

9,302

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

The picture

790 Duke 18: a strong MOT record by UK norms

Across 582 MOT tests, the 790 Duke 18 returns 88.8% first-time pass — comfortably ahead of the UK fleet average. The single most-logged Major fail is uneven braking force. A missing rear reflector and a non-conforming number plate round out the top three. Average tested mileage sits at 9,302, 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

    Excessive fluctuation in brake effort through each wheel revolution

    11 occurrences · 1.9% of tests

  2. 02

    Reflector missing or reflecting white to the rear

    8 occurrences · 1.4% of tests

  3. 03

    Number plate does not conform to the specified requirements

    6 occurrences · 1.0% of tests

  4. 04

    Lamp emitted colour, position or intensity not in accordance with the requirements

    3 occurrences · 0.5% of tests

  5. 05

    Reflector colour or position not in accordance with the requirements

    3 occurrences · 0.5% of tests

  6. 06

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

    2 occurrences · 0.3% of tests

  7. 07

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

    2 occurrences · 0.3% of tests

  8. 08

    A stop lamp(s) remains on when the brakes are released

    2 occurrences · 0.3% of tests

  9. 09

    Tyre tread depth not in accordance with the requirements

    2 occurrences · 0.3% of tests

  10. 10

    Exhaust noise levels in excess of those permitted

    2 occurrences · 0.3% 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.

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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.

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Buying or keeping a 790 Duke 18?

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 790 Duke 18 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.