Checking wiring and components

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

Check signal cable between heated oxygen sensor (HO2S) #2 and engine control module (ECM) #A35 (#A35) for a short-circuit to ground according to Short-circuit to ground, permanent faults .

Remedy as necessary.

Other information 

• Connecting the breakout box/accessing the control module, see Connecting the breakout box .
• To access/replace the heated oxygen sensor (HO2S) for 5 cylinder engines, see Replacing lambda probes .
• For resistance values, see Component specifications .
• For information about signals, see ELECTRICAL SYSTEM

Fig 1: Identifying Heated Oxygen Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Rear Heated Oxygen Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

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  Refer to Verification