Q7 Quattro V6-3.6L (BHK) (2007)
Oxygen Sensor: Testing and Inspection
Oxygen Sensors after Catalytic Converter, Checking
Oxygen Sensors after Catalytic Converter, Checking
The following procedure is used to diagnose both Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130) and the Oxygen
Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) (G131)
‹› When servicing terminals 3 and 4 in the electrical harness connector of the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter , use
only gold-plated terminals.
Special tools, testers and auxiliary items required
‹› Multimeter.
‹› Wiring diagram.
Test requirements
‹› The Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130)and Oxygen Sensor (O2S) 2 Behind Three Way Catalytic
Converter (TWC) (G131) fuses Ok.
‹› Oxygen Sensor (O2S) 1 (behind Three Way Catalytic Converter (TWC)) Heater (Z29) and Oxygen Sensor (O2S) 2 (behind Three Way Catalytic
Converter (TWC)) Heater (Z30) OK.
‹› Battery voltage at least 12.5 volts.
‹› All electrical consumers such as, lights and rear window defroster, switched off.
‹› Vehicles with automatic transmission, selector lever in position " P" or "N".
‹› 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.
Test procedure
-
Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] See: Testing and Inspection/Scan Tool Testing
and Procedures/Preliminary Check
Start diagnosis
-
Perform the function test in Diagnostic Mode 06. Refer to => [ Diagnostic Mode 06 - Read Test Results for Specific Diagnostic Functions ] See:
Testing and Inspection/Scan Tool Testing and Procedures/Diagnostic Modes 01 - 09/Diagnostic Mode 06 - Read Test Results for Specific
Diagnostic Functions
If the specified values are not obtained:
Checking primary voltage
-
Disconnect the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130) electrical harness connector - 1 - or Oxygen Sensor
(O2S) 2 Behind Three Way Catalytic Converter (TWC) (G131) - 3 -.