TDI Timing Chain Tensioner Failure
SeriousEngineThe hydraulic tensioners for the timing chains can fail, causing a loud rattle on start-up.
Est. Repair Cost: £800–£1,500
Reliability GuideCommon Problems with the
Common Problems with the
2009 Audi A6 Mk3 (C6)
By 2009 the C6 was well into its production run. The timing chain tensioner issue was better understood and later cars had updated parts. The Multitronic CVT remains a risk on FWD cars.
What changed for 2009
- •Updated MMI with improved graphics
- •Revised engine range with better DPF systems
- •Enhanced safety features
- •Updated interior trim options
Common MOT watch-outs
- !Multitronic CVT failures still common on FWD cars
- !Air suspension leaks on equipped models
- !Electrical module faults as mileage increases
5
Known Issues
3
Serious
2
Moderate
0
Minor
All Known Issues
Multitronic CVT Chain and Control Unit Failure
SeriousGearbox & TransmissionFront-wheel-drive models with the Multitronic CVT can suffer chain stretch, cone damage and control board failure, especially if fluid changes have been skipped.
Est. Repair Cost: £1,000–£3,500
Adaptive Air Suspension Leaks
SeriousSuspension & ChassisCars with optional air suspension develop leaks in the air struts or bags, causing the car to sag and the compressor to overwork and eventually fail.
Est. Repair Cost: £700–£2,000
DPF Clogging and EGR Faults
ModerateExhaust & EmissionsTown-driven 2.0 TDI and 2.7 TDI models block their DPFs and develop EGR cooler leaks, causing warning lights and limp mode.
Est. Repair Cost: £250–£1,200
MMI Freeze and Electrical Gremlins
ModerateElectrics & ElectronicsThe MMI infotainment system can freeze or reboot, and various electrical sensors, parking modules and climate control motors can fail.
Est. Repair Cost: £0–£600
Buying Tips for 2009 Audi A6 Mk3 (C6)
- ✓Prefer quattro Tiptronic or manual over Multitronic
- ✓Check air suspension health if equipped
- ✓Later cars with updated timing chain parts are safer