P0161 Oxygen O2 Sensor Circuit Low B2S2

Description and meaning of DTC p0161

This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. Although generic, the specific repair steps may vary depending on make/model. It basically means the PCM detected either an excessive current draw, or anopen or short in the circuit powering the oxygen sensor's heater circuit. Thisis in reference to the Heated Oxygen Sensor (2) located rear of catalytic converter(Bank 2).

p0161 diagnostic trouble code symptoms

There will likely be no obvious symptoms other than MIL illumination.

DTC p0161 - possible causes

A code P0161 may mean that one or more of the following has happened:HO2S heater power circuit openHO2S heater ground circuit openHO2S signal tracking (due to oil or moisture in the connector)HO2S is damaged or has failed PCM has failed

How to fix OBD-II diagnostic trouble code p0161

Replace HO2 SensorRepair open or short in power circuitRepair open or short in ground circuitRepair damaged connector due to tracking

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