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

See Contents
To connect the breakout box and access the control module, see Connecting the breakout box
To access or replace the heated oxygen sensor (HO2S) see Replacing lambda probes
For information about the resistance values, see Component specifications
For information about signals on 5 cylinder engines, see Signal specification or Signal specification

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.