p0421 Replaced front Cat SES Light Came Back On Next Day

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Aug 30, 2012, 07:46 AM

treegreen

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p0421 Replaced front Cat SES Light Came Back On Next Day

Any ideas? It is also probably worth mentioning that i switched out my 02 sensors when the cat was replaced.

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Aug 30, 2012, 03:20 PM

02modlanceroz

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Did you disconnect the battery and reset the ecu? If not, try that first. You might also want to get your firmware updated at the dealership for the recall on the warm-up catalyst

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