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HELP HELP HELP O2 SENSOR on 2003 Toyota Highlander

I VE CHANGED MY O2 SENSOR IT STARTED FIRST NOW CANNOT KEEP THE CAR RUN I NEED TO PUSH THE GAS PEDAL ALWAYS SO I NEED TO CHANGE O2 SENSOR AGAIN ????

Asked by for the 2003 Toyota Highlander
SEEK PROPER DIAG AS YOU ARE WASTING YOUR TIME AND MONEY. O2 SENSOR WILLL NOT NORMALLY MAKE IT START HARD
i know it s not about o2 sensor that the car doesnt run but i want to know what might be ??? i just told what i did and what happened to car after changed o2 sensor