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 and oxidation

Check the cable for an open-circuit.

Check between:

Engine control module (ECM) #A92 (#B32) and lambda probe #2 (wiring for calibration current).

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

Fig 1: Identifying Front Heated Oxygen Sensor Connector Terminals

Courtesy of VOLVO CARS CORPORATION

Fig 2: Identifying VCT2000 Diagnostic Tool Symbol In VIDA

Courtesy of VOLVO CARS CORPORATION

Fig 3: Identifying Preheating Circuit In Front Lambda Probe

Courtesy of VOLVO CARS CORPORATION