Checking the components and wiring

CAUTION:

Do not apply rust solvent spray or grease to the heated oxygen sensor (HO2S) connector.

Check the heated oxygen sensor (HO2S) connector. Check for contact resistance. Check for an open-circuit. Check for oxidation.

Check the cable between engine control module (ECM) terminal #A41 (#A41) and heated oxygen sensor (HO2S) terminal #1. Check for an open-circuit.

NOTE:

If possible, measure from the rear of the affected connectors in order to minimize any damage and future loose connections.

Try a new heated oxygen sensor (HO2S) if the above fault-tracing does not remedy the fault.

Remedy as necessary.

Other information

See Connecting the breakout box
For information about signals on 5 cylinder engines, see Signal specification
For information about signals for 6 cylinder engines:
- For 6 cylinder engines -2001, see Signal specification
- For 6 cylinder engines 2002-, see Signal specification
- For 6 cylinder engines -2004, see Signal specification
- For 6 cylinder engines 2005-, see Signal specification .
See Heated oxygen sensor (HO2S), replacing
See Contents

Fig 1: Identifying Front Heated Oxygen Sensor Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying VCT2000 Diagnostic Tool Symbol In VIDA

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Front Heated Oxygen Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.