Electronic filter to deleteri p0420

[An1992]

I have a European Toyota yaris 2 from 2007, with a 1.0 1krfe engine with p0420 error.. I purchased an extension to remove the oxygen probe downstream of the catalytic converter, but the error appears again... Currently the probe values ​​are between 0.1 and 0.85volts... I think that sometimes it exceeds this and the error appears.. I would like to modify the electrical wiring of the probe with the electrical filter, so as to always have volts values ​​in the suitable range but I found various information on the net. Do you have the wiring diagram compatible with Toyota Yaris? Thank you