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Audi A4 Quattro 2005 engine with a 3.2L V6 engine. It lists the engine specifications and safety precautions for working on the fuel injection system. It describes how to use a vehicle diagnostic system to relieve fuel pressure in the high-pressure section of the fuel injection system before opening any components in that section. This is done by displaying diagnostic parameters on the system and activating a basic setting to lower the fuel pressure.