2.5l dodge avenger o2 sensor?

i recently replaced an o2 sensor on my 97 avenger because the check engine light came on and the diagnostic tool said it was sensor in bank 1. so the light came on again, i had the diagnostic ran and again bank 1 o2 sensor, so i go to autozone to buy another one and i tell them that i had just recently replaced... show more i recently replaced an o2 sensor on my 97 avenger because the check engine light came on and the diagnostic tool said it was sensor in bank 1. so the light came on again, i had the diagnostic ran and again bank 1 o2 sensor, so i go to autozone to buy another one and i tell them that i had just recently replaced it. the lady told me that the part number they sold me before did not match what i was supposed to have. so i get the correct one and put it on, the light came back on again. now what?
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