Hey guys well I needed a new rear cat 02 sensor awhile ago and I didn't know then that Bosch is the worst brand of car parts for us bonneville owners. Now the SES light hasn't turned off since I put a new one in, so then some people on here told me its probably the Cat, well while I had it in the shop this week for eletrical issues I had him check my Cat as well and he said no its good don't change it...So I'm thinking its that damn rear o2 sensor again.

So I was wondering who sells non Bosch o2 sesnors?

Try here, I just got one myself.

http://www.rockauto.com/catalog/raframecatalog.php?

Thanks man!

What'* the code that'* causing the CEL to come on?

I'll look to see if I can find the thread I had awhile ago that had the code in it, if not I'll get autozone to scan it again for me

Found it!

Code: P0420

How did you determine it was the O2 rather than the cat itself?

Cat was checked as stated above, plus will you told me it probably would be that cat on my other thread awhile ago, so I had my mechanic check it and he said its 100% fine...

So I figured it have to be the o2 again since its saying the rear cat o2 sensor...right?

You should have asked this question in your other topic so we'd know the background on the problem.

Yes, the rear.

I just got one from Rock Auto also. Best deal around. Check Chat sticky for discount code. It'll save you about 5%.