2011 Audi A6 CAHA/CDUC (C7)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

• Timing chain tensioner wear in early 2.0TFSI engines
• DPF clogging on diesel models under short-trip use

First checks

• Inspect timing chain and tensioner
• Check oil leaks around valve cover and oil pan
• Evaluate health of diesel particulate filter for TDI engines

Before replacing parts

• Save fault codes and freeze-frame data before clearing anything.
• Check engine oil, coolant and transmission fluid using the correct temperature and service procedure.
• Verify power, ground, connectors, hoses, leaks and live data before replacing expensive parts.

Important notes

• Engine and transmission availability/variants differ notably by market—European markets had a wider diesel range.
• Oil capacity includes filter change; always confirm with official workshop manual for exact fill amounts per engine variant.