Quote:
Originally Posted by OkieSnuffBox
Curious why you still get CELs
Dudebro, it is hard. It's very hard.
That and I'm hungover as fuck and didn't read the rest of the sentence. That's on me. 
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I think he wants the CEL P0420 active so it does not stop the readyness check from completing. That way he can clear the cel p0420 drive for a bit till readyness check completes then he can pass the emmissions OBD check, while still tuned on catless header.
If you disable the cel code the readyness check wont ever complete and you fail obd readyness check.
just guessing though :-)