How hard is it to change an o2 sensor. where can I find instructions for doing so. I looked in the How-To sticky and couldn't find anything. Thanks

 

It's not too difficult, the only hard part is if it is in an awkward location. You can borrow the O2 removal socket from Autozone for free and take it from there. I had to replace the Bank 1 Sensor 1 on my 01 Max and it was a pain in the ***, almost wish I would've paid Firestone $150 to do it cost me $120 to do.