Checking The Connector

Check the connector for the rear heated oxygen sensor (HO2S). Check for contact resistance and oxidation. Remedy if necessary.

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

Other information 

• For B5xx4T, see HEATED OXYGEN SENSOR (HO2S), REPLACING
• For B6xx4T, see HEATED OXYGEN SENSOR (HO2S), REPLACING .
• see CHECKING WIRING AND TERMINALS

Fig 1: Identifying VCT2000 Diagnostic Tool Symbol In VIDA

Courtesy of VOLVO CARS CORPORATION

Fig 2: Identifying Rear Heated Oxygen Sensor

Courtesy of VOLVO CARS CORPORATION

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  Refer to VERIFICATION