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post #1 of 3 (permalink) Old 01-29-2018, 12:40 AM Thread Starter
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Question check engine light

I have a 2007 scion tc i just recently did a headers swap everything runs great but after driving it for like 5 miles in my check engine light came on so i scanned it and the code that popped up was p0420 can anyone help me out on what it can be?
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post #2 of 3 (permalink) Old 01-31-2018, 06:04 PM
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It is doing what it is supposed to do.
As far as ECU knows, you've got an issue with your cats. Header swap removes the catalytic converter thus causing readings to be wrong, thus causing CEL.
You need to install CEL eliminators.

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post #3 of 3 (permalink) Old 03-26-2019, 09:05 AM
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Nice post. . .
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