Code P0421

I have a 06 mitsubishi endeavor that has an error code p0421. the Obd code p0421, 1999 mazda protege — car forums at edmunds.com Solving the p0421 code: catalyst efficiency below threshold

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Obd code p0421, 1999 mazda protege — car forums at edmunds.com

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Check engine light on with code p0421, how do i fix it?

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P0421 code, how to fix? | Mitsubishi Eclipse 3G Club

P0421 code: warm up catalyst efficiency below threshold (bank 1)

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