IsItAGoodCar
Reliability Guide

Common Problems with the
2011 Mazda 6 (GH)

We've identified 5 known issues that can affect the 2011 Mazda 6 (GH). 3 of these are serious faults that could be expensive to repair.

5
Known Issues
3
Serious
2
Moderate
0
Minor

All Known Issues

Rear Arch, Sill and Underbody Corrosion

SeriousBodywork & Rust

GH cars can rust around the rear arches, sill ends and underbody mounting points long before the cabin or paintwork looks especially shabby.

Est. Repair Cost: £400–£2,000
Warning Signs:

Bubbling paint on rear arches, Flaky underseal, MOT corrosion advisories

What to Inspect:
  • Inspect the rear arches inside and out
  • Check sill ends and jacking points
  • Look underneath for heavy rust around the rear subframe
Verified by IsItAGoodCar Research Team

Diesel DPF and Oil Dilution Trouble

SeriousEngine

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.

Est. Repair Cost: £300–£2,500
Warning Signs:

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

What to Inspect:
  • Check the dipstick level carefully
  • Ask what kind of journeys the car did
  • Look for invoices for DPF cleaning or turbo work
Verified by IsItAGoodCar Research Team

2.2 MZR-CD Timing Chain Elongation and DPF Warning Light

SeriousEngine

The 2.2-litre MZR-CD (R2AA) diesel engine is prone to timing chain stretch, accelerated by diesel oil dilution from interrupted DPF regenerations. When chain elongation exceeds 10.45 degrees, the PCM registers fault code P1336 (camshaft/crankshaft sensor range/performance) and commands the DPF light to flash on the instrument cluster. If driven with a loose chain, the chain will rattle against guides, slip teeth or break, causing catastrophic valve-to-piston contact. Rectification requires replacing the timing chain kit, oil pump chain, tensioner and guides, followed by PCM chain elongation calibration.

Est. Repair Cost: £650–£1,200
Warning Signs:

Flashing DPF warning light on instrument cluster, Metallic rattling or slapping noise on cold start, Diagnostic trouble code P1336 stored in PCM, Engine hesitation under moderate acceleration

What to Inspect:
  • Check whether the DPF warning light is flashing while the engine is running
  • Listen for metallic chain clatter from the timing cover on cold start-up
  • Inspect diagnostic live data for timing chain stretch angle exceeding factory limits
  • Check service history for timely oil changes and chain replacement invoices
Verified by IsItAGoodCar Research TeamUpdated

Bose Audio Amplifier Internal Failure and Parasitic Battery Drain

ModerateElectrics & Electronics

On models equipped with the factory premium Bose audio system (common on Sport and TS2 trims), the digital sound processor amplifier mounted under the driver's seat on UK right-hand drive cars suffers from thermal fatigue and moisture-induced component degradation. Because the amplifier is connected to the CAN-bus network and remains live even when the ignition is switched off, internal short circuits cause harsh machine-gun crackling, sudden bursts of white noise, complete audio failure, or a parasitic battery drain that flattens the 12V battery overnight. Specialist mail-in board-level rebuilds or replacement units are required.

Est. Repair Cost: £150–£450
Warning Signs:

Complete absence of audio output from all speakers, Loud machine-gun popping or crackling through door speakers, Sudden blasts of white noise when opening doors, Flat 12V vehicle battery after being parked overnight

What to Inspect:
  • Test the audio system across all sources to verify clear sound output from every speaker
  • Listen for popping, buzzing or static through speakers when unlocking or opening doors
  • Check the carpet beneath the driver seat for dampness or green corrosion on amplifier plugs
  • Ask if the car has experienced unexplained 12V battery drain when left parked
Verified by IsItAGoodCar Research TeamUpdated

Front Lower Suspension Control Arm Bushing Wear and Ball Joint Play

ModerateSuspension & Chassis

Second-generation Mazda 6 models experience significant front suspension deterioration on UK roads due to speed cushions, potholes and road grime. The rear compliance bushes on the front lower control arms perish and unbond, while the integrated lower ball joint dust covers split and allow grit ingress, causing excessive metal-to-metal play. DVSA MOT test data identifies suspension arm pins, bushes and joints as the single most frequent failure point on GH cars (recorded on over 13% of tests). Because the lower ball joint is pressed into the wishbone, garages generally replace the complete arm assembly followed by four-wheel alignment.

Est. Repair Cost: £220–£500
Warning Signs:

Clunking or knocking noises over speed bumps and rough roads, Vague steering response or wandering on uneven road cambers, Uneven tyre tread wear across inner edges of front tyres, MOT failure for excessive play in suspension ball joint or split dust cover

What to Inspect:
  • Listen for knocking sounds from the front axle during low-speed steering manoeuvres over bumps
  • Inspect the front lower arm rubber bushes for perishing, tears or oil contamination
  • Check the rubber ball joint boots for splits, weeping grease or loose clips
  • Review past MOT history for recurring suspension arm or bush advisories
Verified by IsItAGoodCar Research TeamUpdated

Buying Tips for 2011 Mazda 6 (GH)

  • Inspect the rear arches, sill ends and rear subframe properly; tidy-looking cars can still be crusty underneath.
  • A petrol is the easy recommendation. Diesel cars need evidence of regular long runs and prompt oil servicing.
  • Check the boot floor, door bottoms and MOT history for repeat corrosion advisories.
20102012
Check a 2011 Mazda 6 (GH) by Registration