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Catalytic changed and engine light comes on. code po402, what does this mean?

(2003 Toyota Corolla)
in Plainsboro, NJ on June 29, 2014
different mechanics give me different answers for a changed catalytic converter. had it dx. and engine light still comes on. The last mechanic stated that i needed a double headed converter and I checked auto part store and it stated that I only needed a single headed converter and not a double headed converter? can you clarify this, please?
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Popular Answer
on June 29, 2014
P0402 is not the converter , it;s EGR system. P0420 is for converter below efficiency.
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