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trouble code p0421 and p0431

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08-22-2004, 03:06 PM

anusemoon

anusemoon is offline

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trouble code p0421 and p0431

what do these codes mean.....
p0421 and p0421 ( warm up catalyst efficency below threshold ( bank 1 and 2 ) 98 millenia failed emission test how can i fix this???

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