E46 318sei won't start

Hi every one need seem help please

My BMW e46 318 sei n42 engine won't start now last week it had brand new can sensor both new air mass meter new and I had codes cleared now my problem is the car stopped start 2 days ago and I plugged it in now I keep getting the same codes back if I clear them it will start then when I remove computer turn car off try and start it it will not but when plugged in again it will start again please help me some one I'm pulling my hair out here many thank