Checking components and wiring

Check the resistance of the heated oxygen sensor (HO2S) between terminals #1 and #2.

Check the signal cable between heated oxygen sensor (HO2S) terminal #2 and control module terminal #A6 (#A6). Check the power supply between system relay terminal #3 and heated oxygen sensor (HO2S) terminal #1. Check for an open-circuit.

Remedy as necessary.

Other information 

• For information about signals, see ELECTRICAL SYSTEM
• 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 resistance values, see Component specifications
• 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