Test requirements:

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2004 Audi A6, 2003 Audi S6, 2003 Audi A6, 2002 Audi S6, and 2002 Audi A6. However, it is still accessible from the selected car via links, so may be relevant.

Fuses for engine electronics OK

Ground (GND) connections at engine and transmission OK
Battery voltage at least 12.7 V
Exhaust system free of leaks.
Vehicles with automatic transmission: Selector lever in position "P" or "N".
Electrical consumers switched off (radiator fan must NOT run during test).
A/C switched off.
No DTCs in DTC memory; check DTC memory. See MODE 3: CHECK DTC MEMORY .
Throttle valve angle 10.0 to 20.0 %; "PID 17: Throttle valve position (absolute)". See MODE 1: CHECK MEASURED VALUES .

Let vehicle cool off with the ignition switched off until the following conditions are met:

Intake air temperature 10 to 50 °C; "PID 15: Intake air temperature". See MODE 1: CHECK MEASURED VALUES .
Coolant temperature approximately Intake Air Temperature (10 to 50° C); "PID 05: Cooling fluid temperature". See MODE 1: CHECK MEASURED VALUES .