P0136 02 Sensor Circuit Malfunction (Bank I Sensor 2)
Technical Description
Oxygen O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2)
What does that mean?
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 Bank 1. The O2 oxygen sensor produces a voltage between 0.1 V and 0.9 V. The ECM monitors O2 sensor voltage and determines if exhaust is lean or rich.
O2 sensor voltage is high when exhaust is rich and low when exhaust is lean. The ECM monitors this voltage and increases or decreases fuel injector pulsewidth according to engine fuel/air ratio. If the ECM detects low HO2Sensor voltage for an extended period, it will set P0136 Conditions required to set: HO2 sensor voltage is low for longer than 2 minutes (minutes depend on model of vehicle. Could be up to 4 minutes)
Symptoms
There may be no visible symptoms to the driver. Poor fuel mileage, possible misfire, depending on O2 sensor position when sticking.
Causes
A code P0136 may mean that one or more of the following has happened:
Possible Solutions
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"Delete Error Code Permanently, Disable DTC Error Code Function for p0136 in the ECU"
In extreme cases, we even have the option to permanently remove the specific DTC p0136 and disable the function of the specific error code in the ECU. All other fault code functions will then continue to work to protect the engine. This is different from clearing an error code with a diagnostic device. We have the option to permanently remove the function of the specific error code, so that it never comes back. Also emergency running that occurs on the specific error code can be solved in most cases.
Of course we prefer to first try to solve the cause of the error code, but sometimes the only solution is to permanently disable the DTC function of p0136.
