P1634
This comes on at initial startup and puts the mini into limp mode. I clear it and after a few cycles it goes away.

Its it time for a throttle body or whatever they call it on the N18

 

I googled the code and it reads “ignition 1 power circuit low voltage”.
Hopefully some of our more knowledge members can help further, good luck.

 

Thats the generic code...

The Bently manual states throttle valve spring test, its the same as BMW. I assume its the throttle body testing/setting the initial start position of the valve during initial power application on the start process.

Guess its not too common on the mini