Check Engine Code P0421 on 2003 Hyundai Santa Fe

What does code P0421 indicate that I should have repaired?

by in Hampton, VA on April 09, 2009
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2 answers 1 comment
ANSWER by , April 09, 2009
A code will never point to one item as needing replacement, it takes a diagnosis of the related systems to determine the fault. Here are some things to check for that code: A code P0421 may mean that one or more of the following has happened: * The catalytic converter is no longer functioning properly * An oxygen sensor is not reading (functioning) properly * A spark plug is fouled up
ANSWER by , April 12, 2010
read it somewhere in the manual.timing belt i think.
COMMENT by , June 28, 2013
why is it so important to change the timing belt?????