is the ecu code the code thats engraved all over the motor? like how PR-4 is engraved all over a B18 like on the outside of the head and on the pistons in the block. if not what is that code and does anyone have a link that explains what all the honda codes are?

 

you want the ecu that goes with the motor you have. b18's are p72. my buddies usdm gsr has p72 stamped on everything and my jdm b18 has p72 stamped all over it. or your cel can be on and your ecu will tell you a code for what is wrong.