Home / Makes / Audi / A6 Known Faults Database Audi A6 Common Problems & Known Faults (UK) If you are considering buying a used Audi A6, there are several major reliability issues worth knowing about first. Our garage database tracks 4 known faults for this model, 3 of them rated high severity. Every one below is a repair bill a seller has good reason not to mention.
Are you about to buy a lemon?
Sellers rarely admit these faults outright. Our database tracks 12 specific phrases sellers use in adverts to soft-pedal these exact issues. Paste any Audi A6 advert and we will check it in seconds.
Check an advert now (free) → Free report, no credit card required.
Audi A6 B7 / C6 (2004-2008) problems Engine/Emissions High severity 📝 Editorial
Oil pump balancer shaft hex drive rounds off, causing sudden loss of oil pressure and complete engine destruction Typical symptoms red low oil pressure warning on dash loud metallic grinding from the bottom of the engine sudden turbo failure Affected vehicles
Engines: 2.0 TDI PD (Engine Code BLB / BRE)
Typical mileage: 60000-100000 miles Audi A6 B7 / B8 / C6 (2004-2012) problems Transmission/Clutch High severity 📝 Editorial
Multitronic CVT gearbox clutch pack wear and TCM failure causing juddering and total loss of drive Typical symptoms juddering or shaking when pulling away from a standstill PRNDS display flashing on the dashboard car refuses to shift out of park or neutral Affected vehicles
Engines: All Front-Wheel-Drive Autos
Typical mileage: 60000-100000 miles Audi A6 2004-2015 Models (2004-2015) problems Engine/Emissions High severity 📝 Editorial
Timing chain tensioner failure causing severe rattling; chains are located at the rear of the engine, requiring engine removal to fix Typical symptoms loud metallic slapping/rattling from the back of the engine on cold start rattle persisting for more than 3 seconds engine management light Affected vehicles
Engines: 3.0 V6 TDI
Typical mileage: 80000-140000 miles Audi A6 2008-2014 Models (2008-2014) problems Engine/Emissions Medium severity 📝 Editorial
EGR valve failure and DPF blockage frequently occurring after the 'Dieselgate' emissions software update Typical symptoms flashing glow plug light engine management light limp mode (loss of power) excessive DPF regenerations Affected vehicles
Engines: 2.0 TDI (EA189)
Typical mileage: 60000-100000 miles Repair costs are typical UK ranges, not quotes. Actual cost depends on condition and garage. Data last verified: June 2026