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the codes PO133and PO420 come up on my scanner. I replaced both of the O2 sensors and the code PO132 went off...the other 2 I mentioned are still there. Don't know what to do from here . Don't really want to start replacing parts I don't need. Thanks

Vehicle: 1999 Honda Civic Lx 1.6L

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P0420 most likely is a bad catalytic converter, if there is not engine issue and there is not engine performance issues.

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