P0136 O2 Sensor Circuit Low Voltage (B1S2)

Description and meaning of DTC p0136

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. Essentially the same as P0137,a P0136 code refers to the second oxygen sensor on Bank1. The O2 oxygen sensor produces a voltage between 0. 1 V and 0. 9 V. TheECM monitors O2 sensor voltage and determines if exhaust is lean or rich. O2sensor voltage is high when exhaust is rich and low when exhaust is lean. TheECM monitors this voltage and increases or decreases fuel injector pulsewidthaccording to engine fuel/air ratio. If the ECM detects low HO2Sensor voltagefor an extended period, it will set P0136 Conditions required to set: HO2 sensorvoltage is low for longer than 2 minutes (minutes depend on model of vehicle. Could be up to 4 minutes)

p0136 diagnostic trouble code symptoms

There may be no visible symptoms to the driver. Poor fuel mileage, possiblemisfire, depending on O2 sensor position when sticking.

DTC p0136 - possible causes

A code P0136 may mean that one or more of the following has happened:Faulty O2 sensor leak in exhaust close to O2 sensorShort to voltage on O2 signal circuitOpen in circuit resistance caused by corrosion in connector

How to fix OBD-II diagnostic trouble code p0136

Replace the second oxygen sensor on bank 1Repair open or short in signal circuitClean corrosion from connector

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