Originally posted by Special_Ed:
Hello all,

As my post-count attests, I'm a newbie, but I have been lurking for a while, and have searched a bit.

I recently started seeing poorer milage, and then got a CEL about a week ago. Went to Auto Zone; they pulled PO133, which prompted me to purchase the new O2 sensor for Bank 1 upstream. With the instructions found here, and the help of the easter bunny's small paws, I hope to replace this weekend.

My question: this seems to be a common problem (2.5L w/ 69K) for bank 1, and I'm wondering if I should pre-emptively replace the upstream sensor on bank 2 as a precautionary measure.

I welcome your thoughts on this ... should I expect the bank 2 sensor to expire soon?

Thanks,
-Ed.



When one goes they are all going to fail right after it. Generally they fail about the same time, because they have all been used about the same amount of time.

So yeah if you got extra $$$ laying around then buy the extra one.