I repaired some codes on my chevy cobalt but now am getting P1133

Question

replaced oxygen sensor and fuel pump

Answer 1

P0135 H02S heater performance Sensor 1

P1133 H02S insufficient switching Sensor 1

Recheck the connection, insufficient switching is a indication of not being properly connected , and recheck the torque of the H02S sensor,

​ A H02S sensor or even a A /F  (airflow ratio ) sensor detect oxygen in the exhaust stream by means of heat, The H02S sensor or airflow ratio sensor is no more than a negative temperature coefficient sensor. It measure the heat of the exhaust flow. this determines the fuel ratio content from lean to rich. This is why it is important that the 02 sensor is properly torque down, and no exhaust leak prior to the H02S sensor.