Checking The Components And Wiring

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

Check the cable between engine control module (ECM) terminal #A94 (#B34) and heated oxygen sensor (HO2S) terminal #2. Check for an open-circuit.

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

Remedy as necessary.

Other information 

• see CONNECTING THE BREAKOUT BOX
• see SIGNAL SPECIFICATION (2004, 2005)
• see OXYGEN SENSOR (CATALYST MONITOR SENSOR)
• see CHECKING WIRING AND TERMINALS

Fig 1: Identifying Front Heated Oxygen Sensor Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying VCT2000 Diagnostic Tool Symbol In VIDA

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Front Heated Oxygen Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

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  Refer to VERIFICATION