A4 Quattro Cabriolet V6-3.2L (BKH) (2007)
If the specification was not obtained:
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Replace the faulty Heated Oxygen Sensor (HO2S) before the catalytic converter. Refer to Fuel Injection and Ignition Repair Information.
If the specification was obtained:
Checking voltage supply
Switch the ignition on.
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Using a multimeter, check the Heated Oxygen Sensor (HO2S) electrical harness connector terminal 5 to the Engine Component Power Supply
Relay (J757) terminal 2/87 for voltage.
Switch the ignition off.
Specified value: Battery voltage.
If the specification was not obtained:
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Check the wiring for a short circuit to each other, Ground (GND), or an open circuit.
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Check the electrical harness connector for damage, corrosion, lose or broken terminals.
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If necessary, repair the faulty wiring connection.
If the specification was obtained:
Checking Ground (GND) activation
If the manufacturers test box is being used. Perform the following step.
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Install the test box. Refer to Fuel Injection and Ignition Repair Information.
If the manufacturers test box is not being used. Perform the following step.
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Remove the Engine Control Module (ECM) (J623 ). Refer to => [ ECM, Removing and Installing ] See: Engine Control Module/Service and
Repair/ECM, Removing and Installing.
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Using a multimeter, check the Oxygen Sensor (O2S) Heater electrical harness connector terminal to the Engine Control Module (ECM) (J623)
electrical harness connector T94 for an open circuit.