Why, after replace twice O2 sensor (bank 1, sensor 1) I still got the code P0135?

i am sure you have confirmed already but this is the front sensor on the engine by the radiator suppport. Be sure you have the correct sensor.The next thing to verify is that you have proper voltage to the sensor. you need 12 volts to the sensor for the heater circuit to operate. If you have all the proper voltage and ground readings than it sounds like you have a defective sensor. It is critical to get a good quality sensor.