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prostarthunder -> error code p0421 (4/9/2005 2:37:17 PM)
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this is the code that came up for a protege from a printout at advanced auto parts for taking it there after the check engine light came on:
p0421 warm up catalyst below threshold bank 1
they claim they have no idea what this means.
Would anyone here know what it means and what needs to be done, and possibly a price range?
Thanks in advance.
Candace
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