error code p0421

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error code p0421

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error code p0421 - 4/9/2005 2:37:17 PM

prostarthunder

Posts: 1
Joined: 4/9/2005
Status: offline

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