S8 Quattro Sedan V10-5.2L (BSM) (2009)
Specified value: 1.5 ohms max.
If the specification was not obtained:
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Check the wiring for a short circuit to each other, Battery (+), Ground (GND) or an open circuit.
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If necessary, repair the faulty wiring connection.
If no malfunction is detected in the wiring and if the voltage supply was OK:
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Replace the Engine Control Module (ECM) 2 (J624).
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Assembly is performed in the reverse order of removal.
Final procedures
After repair work, the following work steps must be performed in the following sequence:
1. Check the DTC memory. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] See: Testing and Inspection/Scan Tool Testing and
Procedures/Diagnostic Modes 01 - 09.
2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] See: Testing and Inspection/Scan Tool Testing
and Procedures/Diagnostic Modes 01 - 09.
3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] See: Testing and Inspection/Monitors, Trips, Drive
Cycles and Readiness Codes.
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End of diagnosis.
Oxygen Sensor 4 Heater
The following procedure is used to diagnose Oxygen Sensor (O2S) 4 Heater (Z63) for Heated Oxygen Sensor (HO2S) 4 (G286) which is controlled
by theEngine Control Module (ECM) 2 (J624).
‹› When servicing electrical harness connector terminals for the Heated Oxygen Sensors, use only gold-plated terminals.
Special tools, testers and auxiliary items required
‹› Multimeter.
‹› Wiring diagram.
Test requirements