2005 AUDI S4 BAU/BFB (8E)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

• Supercharger clutch failure
• Carbon buildup on intake valves
• Timing chain tensioner issues

First checks

• Inspect supercharger clutch operation
• Check for oil leaks around valve cover gaskets
• Verify timing chain tensioner condition

Avant de remplacer des pièces

• 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

• 2005 was the last model year for the B6 generation S4 before B7 facelift introduction.
• Market variations typically relate to emissions and transmission options; engine design is consistent globally.