2000 Camry LE (I4)
Automatic, 86,000 miles
Exhaust set up: Ripp headers, Magnaflo Hi-Flo cat, 2" or 2.25" piping (can;t remember...)
Ok, so its been about three months since I have had my Ripp Headers on. And no matter what I do, the p0420 code is always coming back to haunt me. Now recently I discovered I have a cali model since replacing the sensor in the front and finding out it is the more expensive one.
So ive replaced both sensors, tried putting an o2 extender on the sensor after the cat. And this code just wont go away. (Catylst Performing Under Threshold). Now that I have figured out that it is a cali model... I have thought it is probably due to me hacking out both cats and putting in one hi-flow cat.
Now any advice at all for getting this code to go away or advising to my questions would be greatly appreciated...
I have thought of the possibility of putting 2 hi-flow cats on the pipe, I have no idea if this would make any difference (make it worse mechanically and/or performance), but since the car came with two, I thought it might help.
Or, is there a way to get rid of the rear sensor without tripping any codes? Or is an o2 simulator my only option?
Thank you all for reading this and hope someone can help! I would hate to put the factory exhaust back on...