MOT cost .

Mazda

CX 30

1,287 MOT tests analysed. sits above the UK fleet average — here's where CX 30s pass, fail, and end up on the retest sheet.

That's 17.0 points above the UK fleet average across our 1,988 tracked models — a confident result.

Pass

92.8%

Pass-after-fix

2.2%

Fail

4.7%

Avg miles

20,595

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

The picture

Cx-30: a strong MOT record by UK norms

Across 1,287 MOT tests, the Cx-30 returns 92.8% first-time pass — comfortably ahead of the UK fleet average. The single most-logged Major fail is a seriously damaged tyre. A defective wiper blade and wipers that don't clear the screen round out the top three. Average tested mileage sits at 20,595, 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

    A tyre seriously damaged

    18 occurrences · 1.4% of tests

  2. 02

    Wiper blade defective

    17 occurrences · 1.3% of tests

  3. 03

    Wiper blade missing or obviously not clearing the windscreen

    11 occurrences · 0.9% of tests

  4. 04

    Tyre tread depth not in accordance with the requirements

    9 occurrences · 0.7% of tests

  5. 05

    a brake lining or pad worn below 1.5mm

    7 occurrences · 0.5% of tests

  6. 06

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

    7 occurrences · 0.5% of tests

  7. 07

    Engine MIL illuminated indicating a malfunction

    7 occurrences · 0.5% of tests

  8. 08

    A shock absorber damaged to the extent that it does not function or showing signs of severe leakage

    6 occurrences · 0.5% of tests

  9. 09

    Number plate does not conform to the specified requirements

    4 occurrences · 0.3% of tests

  10. 10

    A tyre seriously damaged

    3 occurrences · 0.2% 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 4 failures

£180–£345

If every one of this CX 30'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

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 02 · 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 03 · 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

Buying or keeping a CX 30?

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 CX 30 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.