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

Fail smog codes P0431 and P0421

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Old 04-07-2011, 12:39 PM
rford69's Avatar
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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
jomo1989's Avatar
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P0421 is the Catalytic converter
 
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