A8 Quattro Sedan V8-4.2L (BVJ) (2008)
‹› Battery voltage at least 12.5 volts.
‹› All electrical consumers such as, lights and rear window defroster, switched off.
‹› Vehicles with automatic transmission, shift selector lever into position " P" or "N".
‹› A/C switched off.
‹› Ground (GND) connections between engine/transmission/chassis OK.
‹› Ignition switched off.
Test procedure
-
Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] See: Powertrain Management/Computers and
Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Preliminary Check.
Start diagnosis
-
Remove the rear engine cover - arrows -.
-
Remove the vacuum lines - 3 - and - 4 - from the air guide hose.
-
Disconnect the Mass Air Flow (MAF) Sensor (G70) electrical harness connector - 1 -.
-
Loosen the hose clamps - 2 - and - 5 - and remove the air guide hose.
-
Disconnect the Heated Oxygen Sensor (HO2S) 2 (G108) electrical harness connector - 3 -.