P0136 – O2 SENSOR CIRCUIT FAILURE (BANK 1 SENSOR 2)
Symptoms of P0136 Error Code General
- Engine warning light is on.
- Fuel consumption can be high.
- Excessive smoke emitting exhaust fumes.
Causes of OBD2 code P0136 Generic
Code P0136 may be caused by one or more of the following problems:
- There may be an exhaust gas leakage near the oxygen sensor (O2) (exhaust leakage)
- The oxygen sensor signal cable may be shorted to voltage or ground.
- Perhaps the circuit resistance may be open or short-circuited due to corrosion in the connector.
- The oxygen sensor may be damaged.
DTC Description P0136 Generic
The O2 (oxygen sensor) is responsible for monitoring the oxygen level in the exhaust gas of each bank. The air-fuel mixture must be close to the ideal ratio or stoichiometric mixture for TWC (Three-Way Catalyst) to work best. The output voltage of the oxygen sensor varies according to an approximate stoichiometric ratio.
The ECM (Engine Control module) adjusts the fuel injection time so that the fuel-air ratio is perfect. The oxygen sensor has a voltage of 0.1 to 0.9 V, which reacts to oxygen in the exhaust gas.
The engine control module (ECM) determines that the O2 sensor voltage is high when the mix is rich and the voltage is low when the mix is lean. Thanks to which the injector increases or decreases the fuel dose depending on the fuel-air ratio. If the ECM (Engine Control module) detects that the oxygen sensor voltage does not increase for more than 2 minutes, OBDII diagnostic code P0136 is set.