S8 Quattro Sedan V10-5.2L (BSM) (2009)
Control Systems/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: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes.
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End of diagnosis.
Oxygen Sensor 4 Heater after Catalytic Converter, Checking
The following procedure is used to diagnose Oxygen Sensor 02S) 4 (behind Three Way Catalytic Converter (TWC)) Heater (Z65) for Oxygen Sensor
(O2S) 4 Behind Three Way Catalytic Converter (TWC) (G288) which is controlled by the Engine Control Module (ECM) 2 (J624).
‹› When servicing terminals in harness connector of Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) use only gold-plated
terminals.
Special tools, testers and auxiliary items required
‹› Multimeter.
‹› Wiring diagram.
Test requirements
‹› Fuse (SC7) OK.
‹› Battery voltage at least 12.5 volts.
‹› All electrical consumers such as, lights and rear window defroster, switched off.
‹› Vehicles with automatic transmission, shift selector lever into position " P" or "N".
‹› A/C switched off.
‹› Ground (GND) connections between engine/transmission/chassis OK.
‹› Ignition switched off.
Procedure
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Raise the vehicle.
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Loosen the quick release fasteners - 1 - and - 2 - and remove the noise insulation panel.