A5 Quattro Coupe V6-3.2L (CALA) (2009)
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Turn the key On.
Specified value: Battery voltage.
If the specification was not obtained:
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Check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G131) electrical harness connector terminal 1 to the Motronic
Engine Control Module (ECM) Power Supply Relay (J271) socket 8 for an open circuit, a short circuit to each other, or Ground (GND).
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Check the electrical harness connector for damage, corrosion, loose or broken terminals.
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If necessary, repair the faulty wiring connection.
If the specification was obtained:
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Turn the key Off.
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 Engine Control Module (ECM) (J623). Refer to the appropriate service information.
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Using a multimeter, check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G131) electrical harness connector to the
Engine Control Module (ECM) (J623) electrical harness connector T94 for resistance.