A4 Sedan V6-2.8L (AFC) (1996)
Oxygen Sensor: Testing and Inspection
Electrical Testing
SENSOR ELECTRICAL TESTS:
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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Disconnect connector for O2S behind three way catalytic converter.
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Switch multimeter (Fluke 83 or equivalent) to resistance measuring range and connect between connector terminals 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 Ohm.
If the specified value is not obtained: