i noticed that mine was loose as well. but far from falling off. using some tools at work i was able to put it back on. <<and much more sturdier than before>>. when i was there, i didnt feel it had a particular purspose, like most things on cars (air conditioner, seat blets Etc:) but for real, i didnt want to harm anything further. call Furd see what they say. BTW what were you doing with the 0s sensor. mine just took a shat yesterday, spitting all kinds of codes at me.