A4 Sedan V6-2.8L (AFC) (1996)
Oxygen Sensor: Testing and Inspection
HO2S After Three Way Catalytic Converter (TWC), Checking
NOTE:
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G130 = O2S behind three way catalytic converter, bank 1
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G131 = O2S behind three way catalytic converter, bank 2
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For functional check of O2S behind three way catalytic converter -G130- or -G131- See Read Measuring value block.
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Disconnect connector for O2S behind three way catalytic converter -G130- or -G131- (component locations refer to "Component Overview - II"
See: Fuel Delivery and Air Induction/Locations ).
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Switch multimeter (Fluke 83 or equivalent) to measure resistance (ohms) and check for continuity between terminal 3 (GND wire) and 4 (signal
wire) of heated oxygen sensor.
If continuity is not obtained:
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Replace heated oxygen sensor.
If continuity obtained:
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Switch multimeter (Fluke 83 or equivalent) to 2 volt range and connect between terminals 3 (GND) and 4 (signal wire) on harness connector.
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Switch ignition ON.
Specified value: 400 ± 50 mV
If the specified value is not obtained, check wiring to ECM as follows:
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Switch ignition OFF.
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Connect VAG 1598/19 test box to ECM wiring harness.
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Check following wiring connections for continuity.
Specified value: max. 1 ohms