Quote:
Originally Posted by mattsbobo
PO420= catalyst Efficiency Below Threshold.
I do have the high flow cat version with no defouler. That being said, I absolutely love my header, and seem to be about the only person on the 8th throwing a CEL with it.
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4 door threw the cell today after a good 1000 miles or so. Technically, the catalytic is there, however thats a race metallic core. So its not a real high flow, its more of a visual cat. That could be the reason.
So in short, run the defoulers and save yourself the headache of having the light later.