S6 Quattro Sedan V10-5.2L (BXA) (2007)
Oxygen Sensor: Testing and Inspection
Oxygen Sensor Heater before Catalytic Converter, Checking
Oxygen Sensor Heater before Catalytic Converter, Checking
Oxygen Sensor Heater
The following procedure is used to diagnose Oxygen Sensor (O2S) Heater (Z19) for Heated Oxygen Sensor (HO2S) (G39) which is controlled by the
Motronic Engine Control Module (ECM) (J623).
‹› 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
‹› Fuse (SA6) 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.