Mazda 6 (GH) Common Problems & Reliability
The second-generation Mazda 6 (GH), produced from 2007 to 2012, was a major evolution of the "Zoom-Zoom" era, offering sharp handling and stylish design in a more refined and practical package. Positioned as a driver-focused alternative to the Ford Mondeo and Volkswagen Passat, it successfully establishment itself as one of the best-handling large family cars of its generation. In the UK, it remains a favorite for used buyers who value driver engagement and high-quality Japanese engineering, with the diverse appeal of its Saloon, Hatchback, and Estate body styles. Reliability for the GH-generation is generally very high for petrol models, with the naturally aspirated 1.8, 2.0, and 2.5-litre engines being exceptionally durable and low-maintenance. However, the 2.2-litre Skyactiv-D diesel engine requires more caution; it is prone to DPF clogging and oil dilution if used primarily for short urban trips, which can lead to turbocharger failure or internal engine wear if the oil level isn’t monitored closely. Additionally, early models can suffer from a "knock" or "play" in the steering rack—a frequent UK MOT failure point—and the Bose sound system amplifier located under the seat is vulnerable to moisture damage. When buying a used GH Mazda 6 in the UK, the naturally aspirated petrol engines are the recommended choices for those who cover lower annual mileages. Prospective owners of diesel models should demand evidence of oil changes every 6,000 miles and check the dipstick for any signs of an "over-filled" oil level, which indicates dilution. It is also important to test the steering for any play and check the rear wheel arches and subframes for early signs of structural corrosion, which remains the car's most vulnerable cosmetic and structural point in the UK’s damp climate. A well-maintained Mazda 6 remains one of the most rewarding and visually appealing cars in its class.
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Detailed fault breakdown, symptoms, and estimated repair bills by production year.
Most Common Mazda 6 (GH) Faults & Repair Costs
Rear Arch, Sill and Underbody Corrosion
GH cars can rust around the rear arches, sill ends and underbody mounting points long before the cabin or paintwork looks especially shabby.
Bubbling paint on rear arches, Flaky underseal, MOT corrosion advisories
- Inspect the rear arches inside and out
- Check sill ends and jacking points
- Look underneath for heavy rust around the rear subframe
Diesel DPF and Oil Dilution Trouble
Short-trip use can overload the DPF regeneration strategy on the 2.0 and especially 2.2 diesels, leading to rising oil levels, warning lights and turbo stress.
DPF warning light, Rising oil level on dipstick, Limp mode after town use
- Check the dipstick level carefully
- Ask what kind of journeys the car did
- Look for invoices for DPF cleaning or turbo work
Buying a used Mazda 6 (GH)? 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.