Dazed and Confused
Join Date: May 2012
Location: Upstate New York
Re: Help with front bank upstream O2 sensor
I've heard both theories on that, the one you received which bears merit, and the old "if it ain't broke, don't fix it" which is not always right, but can also have merit. I've had 2 Grand Prix's and have had to replace one sensor on each, of course it was the one by the firewall (the other 2 are a breeze to get to). You might have to electrically disconnect it and drop the manifold so that you can get on it. That might not be easy, either, under the assumption that you have at least 80000 miles on the car, exhaust bolts don't break away very easily.
Best penetrant that I've ever used is Kroil by Kano. If you can find it, soak it well several times, then try it. Heat also may help if you have acetylene, but if you've all ready used a penetrant, degrease it first. Not sure exactly where it's located, but if you remove the radiator, can you get a better hold on it?
Chewing on asphalt and drinking dinosaur wine