I had a 420 code replaced cat and both o2 sensors. Put over 200 miles on it. on 2001 Toyota Camry

Still have a 420 code insuficent converter. Please advise

Asked by for the 2001 Toyota Camry
2 answers 3 comments
Where did you get the catalyst, and was it CARB OBDII approved?
I bought it online from from auto warehouse the cheapest one not a good idea. Thanks
Run scan data to determine the operating function of the fuel trim, and correct it.
A P0420 has nothing to do with fuel trim. The wonderful USA government mandated that the manufactures have to monitor the cat efficiently. I think cardoclll is correct, you don't have the proper cat on.
Thanks for the info I bought it online , the cheapest one I could find. Not a good idea