CAMARO6 - View Single Post - P0420 Catalyst System below threshold bank 1

est1979 · 12-07-2021, 07:13 PM

Same issue, stock exhaust and had just installed a RotoFab Dry filter intake system, RF replaced and CEL is gone.

What intake is on the car, and have you checked your MassAir connection?

12-07-2021, 07:13 PM	#2
est1979 Drives: none Join Date: May 2021 Location: Southern IL Posts: 48	Same issue, stock exhaust and had just installed a RotoFab Dry filter intake system, RF replaced and CEL is gone. What intake is on the car, and have you checked your MassAir connection?