Club4G Forum : Mitsubishi Eclipse 4G Forums - 2006-2012 Eclipse Authority - View Single Post - Ses code after factory header replacement
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Old January 9th, 2017, 11:31 AM   #3 (permalink)
Desert Rat
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Name: Andy
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Hard to know what to do exactly when you don't have a code, but it's most likely P0421. Spacers on the O2 sensors or a tune is your best bet.

EDIT: Ninja'd
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