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Where are the diagnostic proceedures mentioned in reference to DTC0421

(2003 Kia Optima)
in Belton, TX on June 18, 2013
the blog mentions there is a diagnostic proceedure to find out if the catalytic converter is bad, I was unable to find it
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of Greg's Orange Auto on June 18, 2013
TRY WWW.ALLDATADIY.COM
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