What was wrong with the original engine? Do you still have the original engine?

Needing a ULEV F23A4 motor 2002 honda accord
 

Sorry if posted in wrong area, I looked couldn't see anywhere to post :(.
I still have my 2002 Honda Accord replaced with the engine they sent me which was a F23A1 and now error codes from check engine light. I need to locate a motor for my car anyone know of a state wide search to use? There looking for me but no luck as of yet. I have another post or two about my original motor and the error codes I received after installing there wrong motor (LEV f23a1 into my f23a4 car) it runs fine but cant get check engine with the knock sensor and two transmission codes anymore info would help so I dont have to just pay $85.00 hour for them to just start searching. My thinking is just put correct motor into my car might just be easier and save me problems down the road......................sigh will it end lol :eek:

Check car-part.com

ok more info on my 2002 honda accord lx coupe problem. was told by honda that if I was to order a engine for my car there would be no choice as for asking for a ulev or lev motor. The costs for exchanging the exhaust and intake manifold is about $400.00, so before I do this everyone is asking and telling me that would do this for me that it would make no difference. (question) what difference will this do whats the differrance in the two differant ones?
Cleared the codes again they came back other than the check engine light staying on it runs fine, so not sure where to go or to do I dont want to dump 400.00 into this and this not work I dont mind spending money on the car but I want it to work is all.

Is it hard to replace the intake exhaust manifold? and if I am doing this because of a sensor or something cant I just replace that sensor? instead

Can the computer in my car now be reprogrammed to talk to this motor is thats the problem?...............sigh