A5 Quattro Coupe V6-3.2L (CALA) (2009)
Oxygen Sensor: Testing and Inspection
Oxygen Sensor O2S Heater, Checking
Diagnostic Procedures
Oxygen Sensor O2S Heater, Checking
Observe all safety precautions: => [ Safety Precautions ] See: Computers and Control Systems/Service Precautions/Safety Precautions
View clean working conditions: => [ Clean Working Conditions ] See: Computers and Control Systems/Service Precautions/Clean Working
Conditions
Use only gold-plated terminals when servicing any component with gold-plated electrical harness connector terminals.
For wiring diagrams, component locations, and connector views, Refer to the applicable wiring diagram.
Oxygen Sensor (O2S) Heater (Z19) is part of Heated Oxygen Sensor (HO2S) (G39) and cannot be replaced separately.
Special tools, testers and auxiliary items required
‹› multimeter.
‹› Wiring diagram.
Test requirements
‹› Fuse (SB10) OK.
‹› Motronic Engine Control Module (ECM) Power Supply Relay (J271) OK.
‹› Battery voltage at least 12.5 volts.
‹› All electrical consumers such as, lights and rear window defroster, switched off.
‹› Vehicles with automatic transmission, shift selector lever into position " P" or "N".
‹› A/C switched off.
‹› Ground (GND) connections between engine/transmission/chassis OK.
‹› Ignition switched off.
Test procedure
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Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] See: Computers and Control Systems/Testing
and Inspection/Scan Tool Testing and Procedures/Preliminary Check.
Start diagnosis
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Remove the engine cover with air filter. Refer to the appropriate service information.
Checking internal resistance
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Disconnect the Heated Oxygen Sensor (HO2S) (G39) electrical harness connector - 1 -.