Checking components and wiring

Check the signal cable (+) between heated oxygen sensor (HO2S) terminal #4 and control module terminal #A61 (#B1). Check the signal cable (-) between heated oxygen sensor (HO2S) terminal #3 and control module terminal #A62 (#B2). Check for an open-circuit.

Try a new heated oxygen sensor (HO2S) if the wiring is OK.

Remedy as necessary.

Other information: 

• To connect the breakout box / access the control module, see Connecting the breakout box
• To access or replace the heated oxygen sensor (HO2S), see Heated oxygen sensor (HO2S), replacing
• For information about signals on 5 cylinder engines, see Signal description or Signal specification
• See Contents .

Fig 1: Identifying Heated Oxygen Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Rear Heated Oxygen Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

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  Refer to Verification