ECU serial Number 37820-P5M-L53
ECU serial Number 37820-P5m-L54

whats the difference ? all i know so far is both are automatic's both are for the 5th gen prelude with h22a4 engine any one else have info on this?

 

Normally when the ecu numbers are that close and off by one number it usually means it's just a software update and no big change.

 

yea your right i found out last night its a newer version that replace the old ecu and theres an even newer one that ends with l55 that replaces both of the ones i mention. good to know thanks