A8L Quattro Sedan V8-4.2L (BVJ) (2007)
Oxygen Sensor: Testing and Inspection
Oxygen Sensors and Oxygen Sensor Regulation Before Catalytic Converter, Checking
Oxygen Sensor and Oxygen Sensor Regulation before Catalytic Converter, Checking
Heated Oxygen Sensor 1
‹› Use only gold-plated terminals when servicing terminals in the electrical harness connectors of the Heated Oxygen Sensor (HO2S) (G39).
Special tools, testers and auxiliary items required
‹› Multimeter.
‹› Wiring diagram.
Test requirements
‹› The Motronic Engine Control Module (ECM) (J623) fuses OK.
‹› The Oxygen Sensor (O2S) Heater (Z19) 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
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Perform the function test located in diagnostic mode 06. Refer to => [ OBDMID 01 ($01): Oxygen Sensor
Monitor Bank 1 - Sensor 1 ] See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Scan Tool Testing and
Procedures/Diagnostic Modes 01 - 09/Diagnostic Mode 06 - Read Test Results For Specific Diagnostic Functions.
If specified values are obtained:
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End diagnosis and switch the ignition off.
If the specified values are not obtained:
Procedure
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Remove the rear engine cover - arrows -.