Checking the wiring and component

Check the resistance for the front heated oxygen sensor's coil between #1 and #2. At 20 °C the resistance should be approx. 1.0 Ω.

Check the cable between control module #A18 and front heated oxygen sensor #2 for short-circuit to voltage.

Remedy as necessary.

Other information 

• See connecting the breakout box
• See Checking wiring and terminals. permanent fault
• See Heated oxygen sensor (HO2S), replacing
• See Signal specification
• See Replacing the engine control module (ECM)

Fig 1: Identifying 4-Bit connector

Courtesy of VOLVO CARS OF NORTH AMERICA.

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  See Verification