Checking components and wiring

Check the resistance of the heated oxygen sensor (HO2S) between terminals #3 and #4.

Check the signal cable between heated oxygen sensor (HO2S) terminal #4 and control module terminal #A18 (#A18). Check for a short-circuit to ground.

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 resistance values, see Component Specifications
For information about signals on 5 cylinder engines, see Signal description or Signal specification
See Contents .

Fig 1: Identifying Front Heated Oxygen Sensor Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Front Heated Oxygen Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.