My 525i wont start after cold temps come around. I replaced both camshaft sensors and still the same thing. There are no codes and no pending codes showing. When the car is warm and has been run it will start everytime no problem even if its warm outside and sits overnight it will start but once the temps dropped to about 60 degrees or below it takes numerous trys to start. I've searched everywhere and no one has a for sure fix.

 

well, i'd guess you have a fuel issue. but try and see if thats the case. next time it dont start, spray a little starting fluid in the intake.
then go from there.

 

Check the fuel pressure on the rail when the temp is low.

 

Hi, Did you fauns a solution on your problem? I think I have the same problem only with diesel! Car won't start or starts and immediately turns off.