A8 Quattro Sedan V8-4.2L (BGK) (2006)
Oxygen Sensor: Testing and Inspection
Heater For Oxygen Sensors After Catalytic Converter, Checking
Heater for Oxygen Sensors after Catalytic Converter, Checking
Component location => [ Heater for Oxygen Sensor before Catalytic Converter, Checking ].
Oxygen sensor signals are monitored via On Board Diagnostic (OBD).
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Check DTC memory. If an oxygen sensor malfunction relating to heating circuit is displayed.
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Disconnect respective harness connector for oxygen sensor (connector strip bolted to underside of transmission).
2
4-pin harness connector for Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130) and Oxygen Sensor (O2S) Heater 1
(Z29) behind catalytic converter, bank 1
3
4-pin harness connector for Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) (G131) and Oxygen Sensor (O2S) Heater 2
(Z30) behind catalytic converter, bank 2
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Perform continuity test (resistance measurement) between terminals 1 and 2 of respective sensor connector using portable multimeter (VAG1526).
Specified value at room temperature: 1 to 20 ohms
‹› At higher temperatures, resistance climbs sharply.
If specified value is not reached, replace respective Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130)/Oxygen Sensor
(O2S) 2 Behind Three Way Catalytic Converter (TWC) (G131).
If the specified value is obtained, check voltage supply of oxygen sensor.