Checking the connector

Check power cable terminal #1 in the rear heated oxygen sensor (HO2S) connector. Check for contact resistance and oxidation.

Check ground lead terminal #2 in the rear heated oxygen sensor (HO2S) connector. 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 Heated oxygen sensor (HO2S), replacing
• See Contents

Fig 1: Identifying Rear Heated Oxygen Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

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  Refer to Verification