Honda Service bulletin 07-036, June, 15, 2007
(also applies to 03-05 Civic Hybrids)
A Honda Service Bulletin is not an admission of "guilt" or an acceptance of fault that defines it as warrantable. It is an informational publication written for service personel to disseminate the information and facilitate quality repairs. Need to see one

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DOES NOT APPLY TO ANY CVT (automatic) Insight model.
02-06 Model years
A check engine light with codes P0420, 1420 or 2000 _may_ be caused by overly sensitive programming in the ECM (engine computer) and is correctable for the above models by an ECM "reflash". Your Honda dealer will have to _verify_ eligibility _before_ this repair can be considered for goodwill warranty coverage (coverage beyond the standard warranty)
Honda S.B. 07-038
On 00-01 Model years the ECM is not flashable and will have to be replaced to accomplish the programming update.
So if your failing to pass an emissions test or having any of the above codes you may be able to buy some more time with different programming. But ultimately a CAT (exhaust CATalytic converter) _will_ fail to the point of needed replacement.
Without seperate tailpipe emission testing and the _advanced_ know-how of an expereinced technician it will not be possible to guesstimate how much more CAT life is available or tell if its already past the point of no return. The bulletin does not address these "issues".
HTH!