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I had a major issue with my 2000 Civic HX. It started with the ECM code P1163 and P1164. I bought a new O2 sensor, but the check engine light came back on. I then noticed a crack in the manifold and bought a new Honda one ($600), but the check engine light came on again. So I took it to the dealership and they claimed I needed a new ECU, so I bought a rebuilt one, but the light still came on. I took it back to the dealership and they said I needed a new O2 sensor....again. I said screw it and had them replace it, but the light STILL CAME ON. I returned it to them AGAIN, and they told me the problem is I do not have the updated A33 ECU!!! This just did not make sense. Why would my car suddenly need an updated ECU when the car was built with the A32 (A33 is the newer version)? Does this make sense to anyone? With this logic, my PC may randomly decide it can no longer run on XP and I have to upgrade to Vista, even though my pc was built with XP.
ANYWAYS -

I kept this car for nearly a year, continually having this problem (although I did eventually figure out if I drove the car just the way it wanted, it would not trigger the CEL), then finally got sick of it and sold it. The new owners did not want my 17" alluminum wheels that I put on it and the car has never had a problem since. IT turns out my aftermarket wheels were a little heavier than the originals and were causing a problem for the computer. Just if anyone else has this problem, they might like to know

 

Good info. I bet you want your HX back!

 

Oh, forgot, I do have that Remanufactured ECU Part # 37820-P2N-A32 with only 60 miles on it for sale if anyone else needs one.

 

Actually, in a way I do as it did get about 45mpg on the hwy, but I have a whole new project now. I went from a small fuel efficient vehicle to about the largest car I could find. A 1992 caprice wagon with a 350. Have had it a month, dropped it 2" front 2.5" rear, installed helper bags in back, new fender, new red wheels, new tires, new starter, new factory leather interior (well new to me, but in spectacular condition), new dashboard, new impala ss grill, paintable rocker trim, paintable door handles, etc. Ok, so I like project cars and don't know how to sit still. I should have taken more before and after pics of my civic as it made one hell of a transformation the short period of time I had it too. Really, it was finished so I had to move on even without the problem, but I would have kept it another 6 months if it hadn't been for that issue.