A8 Quattro Sedan V8-4.2L (BGK) (2006)
Oxygen Sensor: Testing and Inspection
Oxygen Sensors Before Catalytic Converter, Checking Signal Wire and Activation
Oxygen Sensors before Catalytic Converter, Checking Signal Wire and Activation
Component location,
‹› Oxygen sensor signals are monitored via On Board Diagnostic (OBD).
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Check DTC memory. If an oxygen sensor malfunction is displayed.
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Disconnect respective harness connector for oxygen sensor.
2
4-pin harness connector for Heated Oxygen Sensor (HO2S) 2 (G108) and Oxygen Sensor (O2S) 2 Heater (Z28) before catalytic converter, bank 2
3
4-pin harness connector for Heated Oxygen Sensor (HO2S) (G39) and Oxygen Sensor (O2S) Heater (Z19) before catalytic converter, bank 1
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Perform voltage measurement between terminals 1 (signal wire) and 5 (sensor Ground -GND-) of connector at wiring harness using portable
multimeter (VAG1526) (measurement range 2 V).
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Switch ignition on.
Specified value: 450 ± 50 mV
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Switch ignition off.
If specified value is not obtained, check wire connections.
If specified value is reached, replace respective Heated Oxygen Sensor (HO2S) (G39)/Heated Oxygen Sensor (HO2S) 2 (G108).