A8 Quattro Sedan V8-4.2L (BGK) (2006)
Ground Wire Connections, Checking
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Check respective wire connection.
Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130), bank 1, with Oxygen Sensor (O2S) Heater 1 (Z29).
Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) (G131), bank 2, with Oxygen Sensor (O2S) Heater 2 (Z30).
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Operate starter briefly. (Do not let engine run longer than 2 minutes, because of malfunction entry)
Specified value: approx. battery voltage
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Switch ignition off.
If specified value is not obtained, check wire connection.
Wire Connections, Checking
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Connect test box (VAG1598/31) to wiring harness of Engine Control Module (ECM).
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Check the following wire connections for open circuit.