Checking Components

Check the connector for the center heated oxygen sensor (HO2S). Check for contact resistance and oxidation.

Try a new heated oxygen sensor (HO2S) if the above fault-tracing does not remedy the fault.

Remedy as necessary.

Other information 

• see SIGNAL SPECIFICATION
• see OXYGEN SENSOR (CATALYST MONITOR SENSOR)
• see CHECKING WIRING AND TERMINALS

Fig 1: Identifying 4-Bit Connector

Courtesy of VOLVO CARS CORPORATION

Fig 2: Identifying VCT2000 Diagnostic Tool Symbol In VIDA (Volvo Scan Tool)

Courtesy of VOLVO CARS CORPORATION

Fig 3: Identifying Rear Heated Oxygen Sensor

Courtesy of VOLVO CARS CORPORATION

• Continue 

  Refer to VERIFICATION