ok .. listen carefully
have you opened it up before this happend or one day u came and it happend
does the code say anything like camshaft output stage ..
if so there are a few things to check ..
1.eccentric shaft sensor ..
if eccentric shaft sensor checks out
2. input stage is intake output stage is exaust depending on that code look into that camshaft actuator .. if you clear the code and it comes back after the second start
its eighter a computer issue ( btw theres an update available for the valvetronics)
theres in a cut wire ..
NOW for what ive seen and repaired
output stage cam code .. did the software update via our shops autologic
second did a visual on the actuator wires and turns out the plastic connector chiped and one wire was sticking out of the connector housing .. could be tricky to fix specially if you call bmw they will want to sell you compete harness..
i used a older bmw wiring harness and matched up the wires and walla
did a syncro of the cams before starting and adjusted the mininum stroke to .08 the car has never idled smooth in its lifespan ..
goodluck i kno my writing is everywhere
but what do you expect from a mechanic lol spend my time in the shop more than english class
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