IsItAGoodCar

2004–2011 Audi A6 Mk3 (C6)

Browse our directory of 2004–2011 Audi A6 Mk3 (C6) vehicles. Access instant MOT history reports, tax status, and reliability insights for any registration listed below.

Registration Directory

Common Problems & Reliability

3
Serious
2
Moderate
0
Minor

The 2004–2011 Audi A6 Mk3 (C6) has 5 known issues. 3 of these are classified as serious faults that could be expensive to repair. 2 are moderate concerns worth inspecting before purchase.

TDI Timing Chain Tensioner Failure

Serious

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

Symptoms: Loud metallic rattle on cold start

Est. repair cost: £800–£1,500

Multitronic CVT Chain and Control Unit Failure

Serious

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.

Symptoms: Judder on acceleration, Rev flare...

Est. repair cost: £1,000–£3,500

Adaptive Air Suspension Leaks

Serious

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.

Symptoms: Car sitting low after parking, Compressor running for too long...

Est. repair cost: £700–£2,000

DPF Clogging and EGR Faults

Moderate

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

Symptoms: DPF warning light, Limp mode...

Est. repair cost: £250–£1,200

MMI Freeze and Electrical Gremlins

Moderate

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

Symptoms: MMI screen frozen, Climate control fan issues...

Est. repair cost: £0–£600

View detailed Audi A6 Mk3 (C6) fault guide

Buying Tips for the 2004–2011 Audi A6 Mk3 (C6)

  • ✓On 2.7 and 3.0 TDI models, listen for a rattle on cold start (timing chain tensioners)
  • ✓Check all MMI functions; a leak from the rear wash-wipe can fry modules in the boot
  • ✓Avoid Multitronic CVT gearboxes if possible

Check Any Vehicle

Don't see your specific car listed? Enter any UK registration number for an instant vehicle history check — including MOT history, tax status, finance check, and write-off data.

Free Vehicle Check