oh yes....you'll have a few if its post '96....
you'll either have a singled-wired O2, or a 4-wired O2..... '94 and newer, it'll be 4-wired(heated O2) sensor. the price difference between the two are significant. if you unfortunately have the heated O2, you're looking $40-$60 each [img]/wwwthreads_images/icons/frown.gif[/img]
you can get them at the dealer or at autozone or somewhere like that. Bosch makes a good replacement sensor.
before you try to undo the nut, warm up the exhaust a little bit by running the truck. then spray the wd40...uh, i guess watch out for flames [img]/wwwthreads_images/icons/crazy.gif[/img] [img]/wwwthreads_images/icons/laugh.gif[/img]
<font color=blue>Shorts</font color=blue>
is stuck? [img]/wwwthreads_images/icons/crazy.gif[/img]