A5 Quattro Coupe V6-3.2L (CALA) (2009)
Oxygen Sensor: Testing and Inspection
Heated Oxygen Sensor HO2S, Checking
Diagnostic Procedures
Heated Oxygen Sensor HO2S, Checking
Observe all safety precautions: => [ Safety Precautions ] See: Service Precautions/Safety Precautions
View clean working conditions: => [ Clean Working Conditions ] See: Service Precautions/Clean Working Conditions
For wiring diagrams, component locations, and connector views, Refer to the applicable wiring diagram.
‹› Use only gold-plated terminals when servicing terminals in the electrical harness connector of the Heated Oxygen Sensor (HO2S) (G39).
Special tools, testers and auxiliary items required
‹› multimeter.
‹› Wiring diagram.
Test requirements
‹› The Heated Oxygen Sensor (HO2S) (G39) fuse SB 10 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.
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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Connect scan tool.