Checking cables

Check front heated oxygen sensor (HO2S) connector for contact resistance and oxidation according to Contact resistance and oxidation .

Check signal cable (+) between control module #A42 and heated oxygen sensor (HO2S) connector terminal 4 for an intermittent open-circuit according to Open-circuit, intermittent faults .

Check signal cable (-) between control module #A41 and heated oxygen sensor (HO2S) connector terminal 3 for an intermittent open-circuit according to Open-circuit, intermittent faults .

Other information 

• To connect the breakout box, see connecting the breakout box
• To access the control module, see Replacing the engine control module (ECM)
• To access/replace the heated oxygen sensor (HO2S), see Heated oxygen sensor (HO2S), replacing
• For information about signals, see Signal specification .

Fig 1: Identifying 4-Bit connector

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

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