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 for a short-circuit to ground.

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.