The ECM (Engine Control Module) monitors the oxygen sensor's voltage and determines if the exhaust is running lean or rich. It is the ECM's job to increase or decrease fuel injection input according to the engine's fuel/air ratio, reported by the oxygen sensor. When the exhaust is running lean (not enough oxygen), the oxygen sensor's voltage will be too low. If the ECM detects that the voltage is too low for an extended period of time (the length of time varies depending on the make and model of the vehicle), it will set the P0136 code.
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HI WHAT HAPEND CODE 136 CHEVROLET CRUZE 2012 MODELMANUAL
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