Used car guide

2018 Mazda 6: common problems and what to check

What gets flagged at MOT on 2018 Mazda 6s, from 3,210 tests in 2025, plus known faults and what to look at before you buy one.

3,210MOT tests in 2025
82%pass first time (all 2018 cars: 81%)
8,600typical miles a year
3.6×the usual rate for rigid brake pipes

What stands out

Parts flagged at MOT more often on 2018 Mazda 6s than on all cars registered in 2018.

  • Rigid brake pipes3.6× usual
    Mazda 6
    2.9% All 2018 cars
    0.8%

    Failed outright at MOT: 0.3%, against 0.1% of all 2018 cars. The rest were advisories or minor defects.

    Rough price £100–£400 our estimate

    At the viewing: Ask to see underneath, or check the MOT advisories: corroded brake or fuel pipes get worse every year and fail the MOT when they do.

By area

The share of 2018 Mazda 6 MOT tests where testers flagged each area, as a fail or an advisory. Rough prices are typical independent-garage costs.

  • Tyres
    29% of testsRough price £70–£150

    At the viewing: Check the tread on all four tyres, including the inside edges, and look for cracks or bulges.

  • Brakes
    25% of testsRough price £150–£350

    At the viewing: Look for a lip on the disc edges and feel for judder or pulling when braking firmly from about 40mph.

  • Suspension
    12% of testsRough price £120–£400

    At the viewing: Listen for knocks over speed bumps, and look behind each front wheel for a snapped coil spring.

  • Wipers, windscreen and mirrors
    6% of testsRough price £15–£250

    At the viewing: Check for chips in the driver's view, and test the wipers and washers.

  • Lights and electrics
    5% of testsRough price £10–£80

    At the viewing: Ask a friend to check every light, including brake lights and indicators, while you operate them.

  • Seats and seatbelts
    3% of testsRough price £80–£250

    At the viewing: Pull each seatbelt sharply. It should lock, and retract cleanly.

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Other years

YearMOT testsMost flagged
2022716Tyres 16%
2021658Tyres 23%
20201,048Tyres 24%
20194,395Tyres 27%
20174,653Tyres 30%
20166,752Suspension 30%
20156,282Suspension 36%
20145,727Suspension 41%
20133,778Suspension 44%
20122,571Suspension 45%
20113,366Suspension 45%
20104,225Suspension 49%
20093,024Suspension 51%
20082,532Suspension 52%
20071,782Suspension 57%
2006972Suspension 51%
2005566Suspension 55%

Where this comes from: the DVSA's anonymised results for every MOT test in Great Britain in 2025, counting tests of 2018 Mazda 6s registered in 2018. "Flagged" includes advisories, so it isn't the same as a fail rate. How we score