Okay, I was hoping someone could give me some advice on actually getting to the O2 sensor on my car (remove and replace). I took a look at it looks like a pain in the a@@ to get at, any easy suggestions to get that sucker out (from above, below, small wrench, socket etc...)?

You may need to soak the sensor with some liquid wrench or break free for day or two. I would recommend getting a O2 socket or wrench for removal and installation. If it'* the stock sensor, you will most definitely need to man handle it out.

Here'* a write up on it, will be a little different on your year. Hope this helps.

https://www.gmforum.com/t278913/

Seems like I don't have any room to even get a wrench on there, maybe I need to try harder, or get a shorter wrench. Is it easier from up top or from the bottom? I am sure it is the stock sensor, so will take some time!!!

Personally I don't care for those O2 sockets. Some of them flex and slip. I've been able to get a I think it'* a 7/8 wrench on it and force it loose with the help of penetrating oil. If you do get a socket get a good hardened one.

Yeah, Dan, I saw the write up, just seems a super pain for me to even get to it, just wondering if anyone had tried anything to get the darn wrench in there....I will head out there (once Milwaukee warms up) and give it some more looking.

Remove the intake plenum (rubber part from the air box to the throttle body) and go from the top. If you use a socket and a long extension to the wrench, you can get it. As Dan said...get a hardened socket, but the penetrating oil is going to make it easier.

If you need help, I'm not that far from you. Once you break it loose a crows foot works good to remove it.

Thanks, guys, got it loose, took some elbow grease, but got old one out and new one in, first change of the sensor after over 133k miles! See if I notice a difference.

nice to see a thread where everyone dosent jump on the take it to a shop bandwagon.