P0420
P0420
Keep having this pop up. I have the ZZP header and DP with high flow cat installed. But its just popping up this past week. And it pops up at idle only.
They did say the cat is on borderline of throwing the code..
They did say the cat is on borderline of throwing the code..
true it doesn't affect performance just gives you that annoying check engine light, like i said a tune from Trifecta or HP will make that code go away. I just got tune from Trifecta 3 weeks ago because of this code. Haven't seen it since then, plus you get the most out of your ride from what you have.
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SprChrg4Life
2.0L LSJ Performance Tech
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Jun 20, 2010 03:15 PM



