DTC-status: ECM-2120, Front heated oxygen sensor (HO2S), control Signal too high

Read off the DTC status. Check the status of the relevant Diagnostic Trouble Code (DTC).

Fig 1: Identifying VCT2000 Diagnostic Tool

Courtesy of VOLVO CARS OF NORTH AMERICA.

Was the status of the relevant Diagnostic Trouble Code (DTC) displayed as permanent? 

• YES 

  Refer to Checking wiring and components 

• NO 

  Refer to Checking cables