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 41,728 MOTs done during 2023–2025), and what to check before you buy one.

The 2026 Mazda CX-30

Cars registered in 2026 haven’t had their first MOT yet (it’s due at 3 years old), so there are no MOT results to show. There are no known faults on record for this year in the UK buying guides we use, so the rest of this page covers the Mazda CX-30 as a whole.

7,195registered new in 2026 so far
2029first MOT due
Petrolfuel type
What to check on a 2026 car
  • Warranty left

    Ask for the date it was first registered and check how much of the maker’s warranty is left, and that it transfers to you. Electric and hybrid batteries usually have a longer, separate warranty.

  • Servicing

    Servicing on time with the maker’s schedule keeps the warranty valid. Ask for the service book or the dealer’s digital record.

  • Finance

    Nearly new cars are often still on finance. A history check shows outstanding finance, and whether it has been written off or stolen.

  • Recalls

    Ask whether any recall work has been done, and check the reg on GOV.UK’s free recall checker.

  • Logbook (V5C)

    The name and address should match the seller, and the VIN on the V5C should match the car.

Check for recalls on GOV.UK

Other years

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% +46,466
202192%87% +515,890
202091%87% +418,472
201988%85% +3647

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