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I actually have the old cat in my garage ( I can't remember tossing it) I'll take a look and get back to you on that. Can we post Imgur links in this forum?

Sorry for late reply. Decided to put in a new catalytic converter (found one on ebay for $130.00+shipping) and its running like new again! I hope to get another 2-3 years out of this car.

Thanks...

I got the cat furthest from the engine checked and it looks fine according to the mechanic.Took it to Nissan and they couldn't figure it out. Going to try another mechanic tomorrow and suggest the...

Im in the exact same boat! 250k same problem, changed the MAF sensor, did throttle body and still getting the same thing. You able to give an update Gary?