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Originally Posted by wquon
Original post is years ago. But if anyone is still having this issue. I'm in Calgary and winters can get down to -40C sometimes. If your car is lagging. First thing you guys should check is your battery. If it's old, might not have enough cold cranks, or not storing enough power. If the battery is low. The vehicle does everything it can to start the vehicle, but a monitoring chip will not provide full power to the vehicle to ensure it can get you home (even if it is a slow drive) safely. This happened to my 06 330xi last winter one time. It was due to my battery. Got it replaced immediately, no issues since. If you check up on the fault codes it lists battery issues when the check engine light comes on as well. So if anyone is still reading this post, have the battery checked before you jump to throttle body conclusions. Cheers.
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My battery was new.
It really was a frozen throttle body.