I bought this civic, that had an incomplete swap. It has an h22a4, I think it was converted to obd1 because its running on a po6 right now. But I have a cel for an o2 sensor which is broken, and for a tdc sensor. Now since the ecu that I will install tomorrow is a reflashed p28, should a use a o2 sensor for a 95 civic ex? or for a 95 prelude? or are they the same? Is the tdc sensor in the distributor? How can I tell if my distributor is an obd2 that was converted or an older one? Does the older one have it in there? Thanks for anyones input. I hate trying to pick up where someone left off, especially when the wiring looks like someone did with whatever they had laying around.