2018 Mazda 6: common problems and MOT failures

What goes wrong more than usual on a 2018 Mazda 6?

Parts flagged at MOT more often on the 2018 Mazda 6 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.

Common 2018 Mazda 6 MOT failures and advisories

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.

Known faults on the 2018 Mazda 6

Reported by owners, mechanics and buying guides for this model and age. Check which engine the car has, as some apply to one engine only.

• Diesel in the oil (particulate filter)

  Diesel

  If the engine is switched off during particulate filter cleaning, fuel can get into the oil and raise the level, which can damage the engine.

  At the viewing: Check the oil isn’t above the max mark and ask what journeys it does.

  Source: What Car?: used Mazda 6 (2013-2022) reliability

• Airbag inflator and boot strut recalls

  All engines

  Driver’s airbag inflators can rupture after long exposure to humidity and must be replaced, and boot struts were recalled in 2017.

  At the viewing: Ask a Mazda dealer to confirm the recalls were done.

  Source: What Car?: used Mazda 6 (2013-2022) reliability

• Warped brake discs

  All engines

  It can be hard on its brake discs, causing vibration under braking.

  At the viewing: Brake firmly from speed and feel for shaking.

  Source: What Car?: used Mazda 6 (2013-2022) reliability

Questions to ask the seller before buying a 2018 Mazda 6

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

1. Does it do regular motorway runs?
2. Any recent work on the rigid brake pipes? (Flagged at MOT 3.6× as often on the 2018 Mazda 6 as on other cars the same age.)
3. Can I see the service history and receipts for any big jobs?