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Home >> Volvo >> 2004 >> S80 Base, 2.5 59, FWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control Module (ECM) Diagnostic Trouble Codes - 5 Of 11 >> ECM-2B20: Heated Oxygen Sensor (Ho2S) Bank 2, Preheating. Signal Too High (B6294S2; B6294T; 2002-2004) >> Signal too high >> Checking components and wiring >> Notes

Checking components and wiring: Notes

Check the resistance of the heated oxygen sensor (HO2S) between terminals #1 and #2.

Check the signal cable between heated oxygen sensor (HO2S) terminal #2 and control module terminal #A8 (#A8). Check for a short-circuit to supply voltage.

Remedy as necessary.

Other information: 

Fig 1: Identifying Rear Heated Oxygen Sensor (HO2S) Connector
GLL104129Courtesy of VOLVO CARS OF NORTH AMERICA.
Fig 2: Identifying Voltage Display
GLL101041Courtesy of VOLVO CARS OF NORTH AMERICA.
Fig 3: Identifying Rear Heated Oxygen Sensor (HO2S)
GLL102933Courtesy of VOLVO CARS OF NORTH AMERICA.