Q7 Quattro V6-3.6L (BHK) (2007)
Oxygen Sensor: Testing and Inspection
Heated Oxygen Sensors and Oxygen Sensor Regulation before Catalytic Converter, Checking
Heated Oxygen Sensors and Oxygen Sensor Regulation before Catalytic Converter, Checking
The following procedure is used to diagnose both Heated Oxygen Sensor (HO2S) (G39) and Heated Oxygen Sensor (HO2S) 2 (G108)
‹› Use only gold-plated terminals when servicing terminals in the electrical harness connectors of the Heated Oxygen Sensor (HO2S) (G39) and
Heated Oxygen Sensor (HO2S) 2 (G108).
Special tools, testers and auxiliary items required
‹› Multimeter.
‹› Wiring diagram.
Test requirements
‹› The Heated Oxygen Sensor (HO2S) (G39) and Oxygen Sensor (O2S) 2 Heater (Z28) fuses OK.
‹› The Oxygen Sensor (O2S) Heater (Z19) and Oxygen Sensor (O2S) 2 Heater (Z28) before catalytic converter OK. Refer to => [ Heated Oxygen
Sensors, Checking ] See: Heated Oxygen Sensors, Checking.
‹› 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.
Test procedure
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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
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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
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Disconnect the black Heated Oxygen Sensor (HO2S) (G39) electrical harness connector - 2 - or the Heated Oxygen Sensor (HO2S) 2 (G108) - 4 -.