Q7 Quattro V8-4.2L (BAR) (2008)
Specified value: 1.0 to 20.0 ohms (at approx. 20° C)
If the specification was not obtained:
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Replace the faulty Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC).
If the specification was obtained:
Checking voltage supply
Switch the ignition on.
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Using a multimeter, check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) electrical harness connector terminal 1 to the
Engine Component Power Supply Relay (J757) terminal 2/87 for voltage.
Specified value: Battery voltage.
Switch the ignition off.
If the specification was not obtained:
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Check for faulty relay.
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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.
If the manufacturers test box is not being used. Perform the following step.
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Remove the Motronic Engine Control Module (ECM) (J623). Refer to => [ Engine Control Module, Replacing ] See: Engine Control
Module/Service and Repair/Engine Control Module, Replacing.
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Using a multimeter, check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) electrical harness connector to the Motronic