Fail smog codes P0431 and P0421 - Mitsubishi Forum - Mitsubishi Enthusiast Forums

Mitsubishi Galant A sporty mid-sized sedan offering the perspective buyer a change from the normal mid-size sedan class.

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Old 04-07-2011, 12:39 PM
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Default Fail smog codes P0431 and P0421

I have a 2004 Galant and it failed smog due to the check engine light with codes p0431 and pp0421. What could it be?
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Old 04-08-2011, 09:08 PM
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P0421 is the Catalytic converter
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2004, check, code, codes, diamante, endeavor, engine, es, galant, light, limited, mitsubishi, montero, p0141, p0421, p0431

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