The reason why I ask is I currently bought a 2000 prelude SH model. Not knowing that it has that dum ATTS system that is not friendly with my accord. So I swapped trannys for a 92-96 base model H22 vtec tranny, but now I have to change wiring harness cause the one that came with the engine has the atts included in the wiring. So I went and orderd a 2001 base model h22 vtec wiring harness this will work right. I am going nuts here, and how do I know what is obd2 or obd2b, and what they do.