Checking connector

Fig 1: Engine Start Verification

Courtesy of VOLVO CARS OF NORTH AMERICA.

Ignition off
Check heated oxygen sensor (HO2S) connector for contact resistance and oxidation according to Contact resistance and oxidation .
Reinstall components, reconnect connectors etc.
Start the engine and let it idle.
Read off the front heated oxygen sensor (HO2S) signal diagnostic trouble code (DTC) status.

The text NOT READY is displayed if the diagnosis is underway.

Other information
- To access/replace the heated oxygen sensor (HO2S), see Heated oxygen sensors (HO2S), replacing .
- For information about signals:
  - 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 .
Fig 2: Identifying Front Heated Oxygen Sensor Connector Terminals
Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying VCT2000 Diagnostic Tool Symbol In VIDA
Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 4: Identifying Front Heated Oxygen Sensor
Courtesy of VOLVO CARS OF NORTH AMERICA.

Is FAULT NOT REGISTERED displayed?