RS 4 Quattro Cabriolet V8-4.2L (BNS) (2008)
Oxygen Sensor: Testing and Inspection
Heated Oxygen Sensor 2 and Sensor Regulation Before Catalytic Converter, Checking
Heated Oxygen Sensor 2 and Sensor Regulation before Catalytic Converter, Checking
The following procedure is used to diagnose Heated Oxygen Sensor (HO2S) 2 (G108) which is controlled by the Engine Control Module (ECM) 2
(J624).
‹› Use only gold-plated terminals when servicing terminals in the electrical harness connectors of the Heated Oxygen Sensor (HO2S) 2 ( G108).
Special tools, testers and auxiliary items required
‹› Multimeter.
‹› Wiring diagram.
Test requirements
‹› The Engine Control Module (ECM) 2 (J624) fuses OK.
‹› The Oxygen Sensor (O2S) 2 Heater (Z28) before catalytic converter OK.
‹› Battery voltage at least 12.5 volts.
‹› All electrical consumers such as, lights and rear window defroster, switched off.
‹› A/C switched off.
‹› Ground (GND) connections between engine/transmission/chassis OK.
‹› Exhaust system between catalytic converter and cylinder head properly sealed.
‹› Coolant Temperature at least 80° C.
Function test
-
Perform the function test located in diagnostic mode 06. Refer to ADD LINK.
If specified values are obtained:
-
End diagnosis and switch the ignition off.
If the specified values are not obtained:
Test procedure
-
Perform a preliminary check to verify the customers complaint. Refer to => [ General Diagnosis ] See: Computers and Control Systems/Testing
and Inspection/Initial Inspection and Diagnostic Overview/General Diagnosis.
Start diagnosis
-
Raise the vehicle.
-
Disconnect the black Heated Oxygen Sensor (HO2S) 2 (G108) - 4 -.