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Home >> Volvo >> 2004 >> S80 Base, 2.9 92 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Module (ECM) Diagnostic Trouble Codes - 4 Of 11 >> ECM-2810: Front Heated Oxygen Sensor (Ho2S), Bank 1 Heating. Signal Too High. Permanent Fault (B5254T2; 2004) >> Signal too high. Permanent fault >> Checking components and wiring >> Notes
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Checking components and wiring: Notes

Check the resistance of the heated oxygen sensor (HO2S) between terminals #3 and #4.

Check the signal cable between heated oxygen sensor (HO2S) terminal #4 and control module terminal #A18 (#A18). Check for a short-circuit to supply voltage.

HINT: Use a test lamp with at least a 3 W bulb to determine whether the cable is short-circuited to supply voltage. 

Remedy as necessary.

Other information 

Fig 1: Identifying Front Heated Oxygen Sensor Connector Terminals
GLL104133Courtesy of VOLVO CARS OF NORTH AMERICA.
Fig 2: Identifying Voltage Display
GLL101041Courtesy of VOLVO CARS OF NORTH AMERICA.
Fig 3: Identifying Front Heated Oxygen Sensor
GLL102931Courtesy of VOLVO CARS OF NORTH AMERICA.