2012 AUDI A8 CDUC/CDUA (4H)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

• Air suspension wear and compressor issues
• Timing chain tensioner failures on some petrol V8 engines
• High-pressure fuel pump failures (FSI engines)
• Diesel particulate filter clogging in diesel variants

First checks

• Verify full service history with oil and timing maintenance
• Inspect air suspension components
• Check DPF status and possible regeneration history for diesel models
• Scan for ECU fault codes related to fuel system and timing

Antes de cambiar piezas

• 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

• Market-specific engine availability varies; North America typically had petrol V8 models while Europe had several diesel options.
• W12 engine is rare and mostly Europe/Asia market-specific; confirm application if present.