Code check on register four please, code check...

[Bonkers]

P0420
"Catalytic Effeciency (Bank 1)"

Looking to know whatever there is to know about this code. I have brand new
Bellangers, Roe Hi-flo, B&B back, and two brand new O2 sensors. Threw the code
on a long strech of open highway in cool weather.

 

[Viper Wizard]

Hey Bonk,
That's from the Hi-flow's, install a couple of rear O2 sims and in will leave you along. That code is also NO BIG deal!