P0161 Code - HO2S Heater Performance Bank 2 Sensor 2

Discussion in 'P - Powetrain Codes' started by fault code, Dec 10, 2017.

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  1. fault code

    fault code Administrator Staff Member

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    What Does P0161 Mean?

    OBD-II Code P0161 is defined as a Oxygen Sensor Heater Circuit Malfunction (Bank 2, Sensor 2)

    The rear Oxygen Sensor is located in the exhaust system behind the catalytic converter(s). It sends critical feedback data to the Power Train Control Module or (PCM) that tracks the operational efficiency of the Catalytic Converter. It collects this data by measuring the amount of oxygen in the exhaust gases leaving the Catalytic Converter. Oxygen Sensors have their own electrical heating element that maintains the optimal operating temperature that ranges from 300 to over 600 degrees F.

    Code P0161 sets when the Powertrain Computer or PCM has determined that the Oxygen Sensor Heating Circuit is malfunctioning. This means that the Heating Circuit is using too little or too much electrical power.

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    What are the common causes of P0161 ?

    The P0161 trouble code is caused by an incorrect amount of resistance in the heater circuit. The powertrain control module constantly monitors the resistance of this circuit. When resistance is out of specifications with this trouble code set.

    What are the symptoms of P0161 ?

    These could include a lean or rich condition in the engine, decreased fuel efficiency, black smoke from the tailpipe, and an illuminated service engine soon lamp.

    How do you troubleshoot P0161 ?

    Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Pull the connectors apart and carefully look at the terminals (the metal parts) inside the connectors. Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed.



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