Hi all, I have plan to replace the ECM for my 99 Max. I couldn't find a used ECM got the same part number with the ECM in my Max, I wonder do I have to get the same part number or not? And after I put a used ECM in do I have to program the key to start ? And what steps I need to be carefull when I replace it? Any body who have done it before,please help me some ideas ! Thanks a lot!