6buyer's guide

The GJ Mazda 6 is a sharp-looking family saloon or estate that attracts buyers looking for something more distinctive than the mainstream alternatives — but the diesel versions in particular carry emissions system risk that catches plenty of people out. A DPF that has lived on short trips, a timing service nobody can prove was done, and a DSG that judders on light-throttle acceleration are the three patterns that define the problem end of the market. This guide covers all ten issues before you travel to view.

This guide covers ten documented issues: AdBlue/DPF/EGR emissions fault, timing belt/chain service risk, DSG/automatic/clutch judder, coolant leak or water pump fault, infotainment/software electrical faults, suspension knocks and tyre wear, brake corrosion or EPB fault, panoramic roof or boot water leak, turbo boost leak or actuator fault, and recall/campaign status. Each fault has a field check and a real repair-cost range.

A documented GJ Mazda 6 bought from an owner who has used it properly on longer runs is a genuinely rewarding used car. One with a patchy diesel service history and no emissions receipts is a different proposition entirely. Ask about the driving pattern, scan the live emissions data, and check the timing invoices before you make any decision.