Question 1

What is TDI Timing Chain Tensioner Failure on the Audi Audi A6 Mk3 (C6)?

Accepted Answer

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

Question 2

What is Multitronic CVT Chain and Control Unit Failure on the Audi Audi A6 Mk3 (C6)?

Accepted Answer

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.

Question 3

What is DPF Clogging and EGR Faults on the Audi Audi A6 Mk3 (C6)?

Accepted Answer

Town-driven 2.0 TDI and 2.7 TDI models block their DPFs and develop EGR cooler leaks, causing warning lights and limp mode.

Question 4

What is Adaptive Air Suspension Leaks on the Audi Audi A6 Mk3 (C6)?

Accepted Answer

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.

Question 5

What is MMI Freeze and Electrical Gremlins on the Audi Audi A6 Mk3 (C6)?

Accepted Answer

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

Question 6

What should I check when buying a used Audi Audi A6 Mk3 (C6)?

Accepted Answer

On 2.7 and 3.0 TDI models, listen for a rattle on cold start (timing chain tensioners)

Question 7

What should I check when buying a used Audi Audi A6 Mk3 (C6)?

Accepted Answer

Check all MMI functions; a leak from the rear wash-wipe can fry modules in the boot

Question 8

What should I check when buying a used Audi Audi A6 Mk3 (C6)?

Accepted Answer

Avoid Multitronic CVT gearboxes if possible

Question 9

What years was the Audi Audi A6 Mk3 (C6) made?

Accepted Answer

The Audi Audi A6 Mk3 (C6) was produced from 2004 to 2011.

Audi Audi A6 Mk3 (C6)

Audi A6 Mk3 (C6) Reliability & Common Faults

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