This all comes down to the catalytic converters. More than likely you will need to replace both of them plus your sensors as well. This can become very expensive with OEM equipment. I would suggest you shop around and see which is cheaper but still has good parts. Hope this helps! Have a good one!
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Sounds like a distributor or timing issue, a common issue
with these cars sometimes. Our Civic LX was giving us the same codes, We
replaced the distributor and reset the timing... problem resolved. Not sure
about the 2005 Civic year model, the ignition system may have changed with the
newer models...
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