Used car guide · 2019–2026

Mazda CX-30 common problems and MOT failures

What goes wrong on a used Mazda CX-30, year by year: known faults from UK buying guides, the parts flagged at MOT more than on other cars (from 41,737 MOTs done during 2023–2025), and what to check before you buy one.

41,737MOTs done in 2023–2025, all years of this model
45,986on the UK register
1known fault across all years
2021best year at its MOT

Pick the year

Most years have their own guide. The year is when the car was first registered (it’s on the logbook, or check the reg below).

20262025202420232022202120202019

What usually goes wrong with a Mazda CX-30?

Known faults reported by owners, mechanics and UK buying guides, in our own words. Most apply to certain years or engines only, so check which the car has.

  • Battery and electrical faults

    Cars registered 2019–2025 · All engines

    Battery problems are the biggest complaint in What Car?'s survey, followed by other electrical faults, infotainment freezes and unexpected warning lights.

    At the viewing: Make sure it starts easily and no warning lights show, and test the infotainment and phone connection.

    Source: What Car?: Mazda CX-30 reliability

Common Mazda CX-30 MOT failures to check

Parts flagged at MOT well above the usual rate for cars the same age, in more than one year. From the DVSA’s results for every MOT done in Great Britain during 2023–2025.

  • Shock absorbers

    up to 7× usual

    Stands out on cars registered in 2019, 2020, 2021 and 2022.

    Rough price £200–£300 (pair, average rear to front) ClickMechanic

    At the viewing: Push down hard on each corner. It should bounce once and settle. Look for oil on the shock absorber body.

  • Brake discs

    up to 2.2× usual

    Stands out on cars registered in 2020, 2021 and 2022.

    Rough price £150–£350 our estimate

    At the viewing: Look through the wheel at the brake disc: a deep lip at the edge or heavy scoring means they're worn. Feel for judder when braking.

  • Brake pads

    up to 1.9× usual

    Stands out on cars registered in 2021 and 2022.

    Rough price £75–£175 (one axle) ClickMechanic

    At the viewing: Listen for squealing or grinding when braking, and look through the wheel at how much pad is left.

Mazda CX-30 MOT pass rate by year

Of the years since 2005 with plenty of MOT tests, the 2021 Mazda CX-30 did best (92% passed first time, 5 points above all 2021 cars) and the 2019 did worst (88%, 3 points above all 2019 cars). Older cars fail more, so compare each year with all cars registered the same year.

YearPass first timeAll cars that yearMOT tests
202394%92% +2253 (small sample)
202293%89% +46,467
202192%87% +515,892
202091%87% +418,472
201988%85% +3653

Questions to ask the seller before buying a Mazda CX-30

Ask before you travel to see it. A seller who knows the car will have answers, and receipts.

  1. Any recent work on the shock absorbers? (Flagged at MOT 7× as often on the Mazda CX-30 as on other cars the same age.)
  2. Any recent work on the brake discs? (Flagged at MOT 2.2× as often on the Mazda CX-30 as on other cars the same age.)
  3. Any recent work on the brake pads? (Flagged at MOT 1.9× as often on the Mazda CX-30 as on other cars the same age.)
  4. Can I see the service history and receipts for any big jobs?

Looking at a Mazda CX-30?

Check the actual car: its own MOT history, whether it already shows these weak spots and what to ask the seller. Free, no sign-up.

Where this comes from: MOT figures are the DVSA’s anonymised results for every MOT test done in Great Britain during 2023–2025, grouped by the year each car was first registered. How many are on the road is from the Department for Transport’s vehicle licensing statistics. Known faults are from UK buying guides, in our own words, with links. How we score