A8 Quattro Sedan V8-4.2L (BGK) (2006)
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Heated Oxygen Sensor (HO2S) 2 (G108) before catalytic converter bank 2, with Oxygen Sensor (O2S) 2 Heater (Z28)
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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.
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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.
Heated Oxygen Sensor (HO2S) (G39) before catalytic converter bank 1, with Oxygen Sensor (O2S) Heater (Z19)
Heated Oxygen Sensor (HO2S) 2 (G108) before catalytic converter bank 2, with Oxygen Sensor (O2S) 2 Heater (Z28)
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Repair open circuit in wiring or short circuit if necessary.
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If wire connection is OK but there is no Ground (GND) activation present for oxygen sensor heater, replace Engine Control Module (ECM), refer
to Repair Manual and generate readiness code again => [ Readiness Code, Generating ] See: Testing and Inspection/Monitors, Trips, Drive Cycles
and Readiness Codes.
