2009 AUDI A8 BKH/CGL (4E)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

• Air suspension failures - compressor or air springs
• Timing chain tensioner wear on V8 engines
• Rust appearing in high humidity climates on lower body panels

First checks

• Check air suspension for leaks or compressor noise
• Inspect timing chain tensioner and guides for wear
• Verify functioning of all electronic modules (CAN bus errors)

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

• The 2009 Audi A8 D3 was a facelifted version introduced in late 2008, sold globally with variations based on emission regulations and market preferences.
• Some engines such as the 3.0 TDI were not available in North America; V8 petrol engines were predominant there.