2004 Audi A6 Mk3 (C6)
Browse our directory of 2004 Audi A6 Mk3 (C6) vehicles. Access instant MOT history reports, tax status, and reliability insights for any registration listed below.
Registration Directory
Showing registrations 1–40 of 1,997 for the 2004 Audi A6 Mk3 (C6). Select any plate for an instant vehicle history check.
Common Problems & Reliability
The 2004 Audi A6 Mk3 (C6) has 6 known issues. 4 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
SeriousThe 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
SeriousFront-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
SeriousCars 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
2.0 TDI Oil Pump / Balance Shaft Drive Failure
SeriousWear 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.
Symptoms: Red oil-pressure warning, Abnormal engine or turbo noise
DPF Clogging and EGR Faults
ModerateTown-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
ModerateThe 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
Buying Tips for the 2004 Audi A6 Mk3 (C6)
- ✓Insist on a stone-cold start to check for V6 TDI timing chain rattle
- ✓Avoid Multitronic CVT cars without perfect service history
- ✓Check all MMI functions including rear wash-wipe module
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