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catalytic changed and engine light comes on. code po402, what does this mean? on 2003 Toyota Corolla

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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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