check engine light after swap!!!?

ok my friend took him civic to some guy to get his d16ysomething, swaped out for a d15b, alittle better engine.

my question is about the code we pulled fromt he civic, the code was 23=knock sensor or circit. dose the d15b have a place for a knock sensor, and if not what do we do, and if so are there problem areas for this to fail.

also i wasent there but the mechanic showed him an electrical plug in that he could not find a place for. we look to see if we could find it agian, but couldnt(it is supposed to be under the intake manifold) and i didnt want to start ripping stuff off if there is an easier way. Any suggestion would help, expierance much needed.

ok..im the friend and i have 96 ex coupe..which came with a d16y8,i blew that motor and swapped in the jdm d15b vtec.i have a check engine light,and i pulled the code..it said it was the knock sensor,i was told there is no place to plug the sensor in on the jdm engine.What can i do with the knock sensor to get rid of the check engine light.

are you using the jdm ecu also and i thought i heard of one of my freinds haveing the same problem and they fixed it by reflashing the timining or something like that i dont remmeber exactly

no it si the usdm ecu, also the computer is automaticlly retarding the timing because of the knock sensor malfuntion, so seting the timing over agian would cause the ecu to retarding the timing agian. if i am wronge, explain

yes there is no place to plug in the knock sensor becuase it is jdm. jdm doesnt come with ks because of emisons and does ur vtec work if it donet then its becuse of the ks i think. not positive though