IsItAGoodCar
Reliability Guide

Common Problems with the
2012 Mazda 6 (GJ)

The GJ Mazda 6 launched in the UK with SkyActiv technology and the striking Kodo design language. The 2.0 SkyActiv-G petrol proved exceptionally reliable, though the 2.2 diesel required careful maintenance.

What changed for 2012

  • •UK launch of third-generation Mazda 6
  • •SkyActiv technology for lightweight construction
  • •Kodo design language introduced
  • •2.0 SkyActiv-G petrol as the reliable choice

Common MOT watch-outs

  • !2.2 diesel oil dilution and DPF stress
  • !Camshaft wear on early diesels
  • !Folding mirror motor failure
3
Known Issues
2
Serious
0
Moderate
1
Minor

All Known Issues

2.2 SkyActiv-D Oil Dilution & DPF Stress

SeriousEngine

Frequent interrupted regenerations let diesel contaminate the oil, accelerating timing chain, turbo and bottom-end wear.

Est. Repair Cost: £500–£4,000
Warning Signs:

Rising oil level on dipstick, DPF warning light, Limp mode after town use

What to Inspect:
  • Check the dipstick level carefully
  • Ask whether the car did mainly motorway miles
Verified by IsItAGoodCar Research Team

Camshaft Wear (Early Diesels)

SeriousEngine

Like the CX-5, early 2.2 diesel 6s suffered from premature camshaft wear leading to metal contamination in the oil and turbo failure.

Est. Repair Cost: £2,000–£4,000
Warning Signs:

Sudden loss of power, Turbo whine, Metal particles in oil filter

What to Inspect:
  • Check if the car had the camshaft recall or replacement work done
Verified by IsItAGoodCar Research Team

Bose Speaker Corrosion

MinorInterior & Trim

Moisture can enter the front door cavities and cause the Bose speaker coils to rust, leading to audio distortion.

Est. Repair Cost: £100–£250
Warning Signs:

Crackling or popping from front speakers, No sound from one side

What to Inspect:
  • Test the audio system at various volumes
Verified by IsItAGoodCar Research Team

Buying Tips for 2012 Mazda 6 (GJ)

  • ✓The 2.0 SkyActiv-G petrol is the safe bet; be very wary of 2.2 diesels used for short trips.
  • ✓Check the saloon boot floor and rear light seals for damp.
  • ✓Make sure the i-ELOOP / i-stop system works properly and shows no charging warnings.
2013
Check a 2012 Mazda 6 (GJ) by Registration