Discussion Starter · #1 ·
I have a 2000 Solara 4cyl. I bought the car with the EGR code and a o2 sensor code. I replaced the EGR valve and cleaned the filter on the vcc and replaced the o2 sensor. That got rid of the codes for a lil while but the EGR code keeps coming back. The o2 sensor code is gone but now instead I have this p0420 code and of course the p0401. I need to get this thing through emissions soon. Any ideas on an underlying issue? Not sure what to do anymore about the EGR and idk y this p0420 catalytic issue came about!!! Any help is greatly appreciated!!