IsItAGoodCar
Reliability Guide

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
6
Known Issues
4
Serious
2
Moderate
0
Minor

All Known Issues

TDI Timing Chain Tensioner Failure

SeriousEngine

The hydraulic tensioners for the timing chains can fail, causing a loud rattle on start-up.

Est. Repair Cost: £800–£1,500
Warning Signs:

Loud metallic rattle on cold start, Camshaft correlation or timing fault codes

What to Inspect:
  • Must be heard from a stone-cold start
  • Ask for tensioner or chain-kit replacement invoices
Verified by IsItAGoodCar Research TeamUpdated

Multitronic CVT Chain and Control Unit Failure

SeriousGearbox & Transmission

Front-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
Warning Signs:

Judder on acceleration, Rev flare, Flashing PRNDS or limp mode

What to Inspect:
  • Drive from cold and check for judder
  • Ask for Multitronic fluid change invoices
  • Prefer quattro Tiptronic if history is unclear
Verified by IsItAGoodCar Research TeamUpdated

Adaptive Air Suspension Leaks

SeriousSuspension & Chassis

Cars 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
Warning Signs:

Car sitting low after parking, Compressor running for too long, Level-control warning

What to Inspect:
  • Check ride height before startup
  • Listen for compressor noise
  • Inspect struts for leaks
Verified by IsItAGoodCar Research TeamUpdated

2.0 TDI Oil Pump / Balance Shaft Drive Failure

SeriousEngine

Wear in the balance-shaft oil-pump drive can cause loss of oil pressure. Applicability depends on engine code and the installed module, including any previous conversion.

Warning Signs:

Red oil-pressure warning, Abnormal engine or turbo noise

What to Inspect:
  • Stop the engine if oil-pressure warning appears
  • Ask for invoices identifying any revised pump drive or balance-shaft repair
Verified by IsItAGoodCar Research TeamUpdated

DPF Clogging and EGR Faults

ModerateExhaust & Emissions

Town-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
Warning Signs:

DPF warning light, Limp mode, Engine management light

What to Inspect:
  • Ask about driving patterns
  • Scan for DPF soot load
  • Check for EGR coolant leaks
Verified by IsItAGoodCar Research TeamUpdated

MMI Freeze and Electrical Gremlins

ModerateElectrics & Electronics

The MMI infotainment system can freeze or reboot, and various electrical sensors, parking modules and climate control motors can fail.

Est. Repair Cost: £0–£600
Warning Signs:

MMI screen frozen, Climate control fan issues, Parking sensor failures

What to Inspect:
  • Test all MMI functions
  • Check climate control at all settings
  • Scan for electrical fault codes
Verified by IsItAGoodCar Research TeamUpdated

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
2005–20082010–2011
Check a 2009 Audi A6 Mk3 (C6) by Registration