Mazda 6 (GJ facelift) Common Problems & Reliability
The 2015-refreshed Mazda 6 (GJ) facelift brought a smarter cabin with MZD Connect infotainment and revised styling, but it still shares the same diesel caveats as earlier GJ models. In the UK, it remains a stylish and engaging alternative to the Volkswagen Passat and Ford Mondeo, with sharp handling and a premium-feeling interior that belies its mainstream price. Petrol cars—particularly the 2.0-litre SkyActiv-G—are the genuinely appealing used buy here, offering bulletproof reliability and linear performance without the DPF and oil-dilution risks of the 2.2-litre SkyActiv-D diesel. Insurance groups are competitive for the class, and Mazda's dealer network in the UK is well-established with reasonable servicing costs. The 2015 facelift also introduced improved sound insulation and updated interior materials, making later GJ models a noticeably more refined place to sit on long motorway journeys. For buyers seeking a large family car that is genuinely enjoyable to drive, the petrol-powered Mazda 6 facelift is a quietly excellent choice.
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Detailed fault breakdown, symptoms, and estimated repair bills by production year.
Most Common Mazda 6 (GJ facelift) Faults & Repair Costs
2.2 Diesel Carbon Buildup
Soot accumulates in the intake manifold and EGR system, causing flat performance, poor economy and repeated regeneration trouble.
Hesitation, Poor fuel economy, Engine light
- Ask if the intake or EGR system has ever been cleaned
MZD Connect Ghost Touching
The infotainment screen can register phantom presses or reboot on its own as the digitiser fails.
Menus changing by themselves, Beeping from the screen, Random reboots
- Leave the system running while stationary and watch for unwanted inputs
2.2 Skyactiv-D Twin-Turbocharger Wastegate and Bearing Failure
On 2.2-litre Skyactiv-D (SH-VPTS) diesel engines, the sequential twin-turbocharger assembly suffers from mechanical failure of the exhaust gas regulation valve (wastegate flapper) inside the turbine housing. The pivot pin and rivet holding the flapper fatigue and shear off, causing sudden loss of boost pressure at lower RPMs and triggering fault code P0299 (turbocharger underboost) alongside severe limp mode. In addition, turbocharger bearings are vulnerable to oil starvation caused by carbonised oil and soot accumulation from DPF regeneration cycles. Replacing the twin-turbo unit requires a revised assembly, new oil feed pipes and thorough oil flush.
Sudden loss of low-end acceleration and engine power, High-pitched whistling or siren noise from turbochargers, DTC P0299 stored in PCM and engine management warning light, Black smoke emissions under acceleration
- Accelerate through low to mid RPMs in 3rd gear to confirm crisp twin-turbo boost transition without hesitation
- Listen closely for whining or siren noises from the turbochargers while revving gently
- Scan the PCM for pending or stored underboost fault codes such as P0299
- Check service invoices to confirm whether modified turbochargers or updated oil feed pipes have been installed
2.2 Skyactiv-D Injector Copper Washer Blow-By and Oil Pickup Blockage
The 2.2 Skyactiv-D engine is prone to premature erosion of the copper combustion chamber sealing washers beneath the fuel injectors. When a washer fails, high-pressure combustion gas blows past the injector into the rocker cover, rapidly baking the engine oil into hard carbon crust and granular sludge. This carbon debris migrates down into the oil sump and chokes the fine wire-mesh oil pump pickup strainer. Oil starvation follows, triggering low oil pressure warnings, grinding exhaust camshaft lobes, vacuum pump failure (causing stiff brake pedals) and catastrophic engine seizure. Preventative replacement of injector washers and sump strainer cleaning is essential.
Low engine oil pressure warning displayed on instrument cluster, Chuffing or ticking sound from fuel injectors under the rocker cover, Engine oil turning abnormally thick, black and gritty, Metallic ticking noise from worn exhaust camshaft lobes
- Remove the oil filler cap while the engine idles and check for puffing smoke or chuffing sounds indicative of injector blow-by
- Inspect the dipstick to ensure engine oil is clean and not contaminated with granular carbon particles
- Verify that the oil pressure warning light extinguishes immediately upon starting from cold
- Ask whether the injector copper washers have been renewed and the oil pickup strainer inspected
Front and Rear Brake Caliper Sticking and Disc Scoring
Third-generation Mazda 6 GJ models are frequently cited in UK MOT test records and owner reports for binding brake calipers. Both the front sliding pins and the rear calipers (which incorporate the electronic parking brake motor mechanism on 2015–2017 facelift models) suffer from corrosion and road-salt ingress through degraded slider boots. The pads drag continuously against the discs, leading to overheated brake corners, scorched or lipped discs, severe brake dust, and premature MOT failure for uneven brake effort or binding brakes. Rectification requires replacing sticking calipers, fitting fresh pads and discs, and lubricating guide pins.
Excessive brake dust and heat radiating from wheel hubs after driving, Vehicle pulls to one side during light braking, Squealing or scraping sound from wheels at low speeds, MOT advisory or failure for brake binding or uneven braking effort
- Feel wheel hubs carefully after a test drive for excessive heat or burning brake smell
- Inspect brake discs for severe grooving, blue heat discolouration or heavy outer lip wear
- Verify that the electronic parking brake releases smoothly without drag on hill starts
- Check MOT history for previous advisories concerning brake binding or disc deterioration
Buying a used Mazda 6 (GJ facelift)? Always check for hidden finance and write-off history.
Mechanical problems are only half the battle. Over 1 in 3 UK used cars checked have unpaid finance or accident write-off records that could cause you to lose the car or thousands in value.