94 dodge spirit keeps blowing o2 sensor and the radio quit

if i put a new o2 sensor on the car it blows it in about 1-2 weeks,thought the first time was just a bad o2 from parts house but after 3 of them and the dodge place can't figure out why this is happening i figured i'd try here. when the sensor goes out the gas mil. gets bad and it smokes black smoke at times. i do have a small oil leak leaking on top of the sensor but i didn't figure that would hurt since it was on the outside if i put a new o2 sensor on the car it blows it in about 1-2 weeks,thought the first time was just a bad o2 from parts house but after 3 of them and the dodge place can't figure out why this is happening i figured i'd try here. when the sensor goes out the gas mil. gets bad and it smokes black smoke at times. i do have a small oil leak leaking on top of the sensor but i didn't figure that would hurt since it was on the outside

What exactly do you mean by it's blowing the O2 sensor? What exactly do you mean by it's blowing the O2 sensor?