Assuming you want to clear/reset the check engine light, if you have successfully made repairs to correct what was the cause of the check engine light to go on the light will clear itself after a few drive cycles.
yes
do you have to reset computer after changing battery in 2003 745li
You do not have to reset the computer.
Take it to the dealer
There is nothing concerning the computer that needs to be reset.
Its in the key switch
No, you do not have to reset the computer. It will take care of itself.
no you dont have to reset the computer after changing the fuel pump
Not necessary. The computer will reset itself after a few driving cycles.
You do not have to reset the computer any more than you reset your computer in your home after a power outage. It will take care of itself.
Yes, you do... But if you do within 1-2 minutes you might not reset the computer.
You do not have to reset the computer after this repair. If the Check Engine Light is on it is not because you made this repair. If you disconnected the battery the computer will reset itself.