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03 745i will not start in the cold

Does anyone have any suggestions as to why my car will not start every time it get really cold; also I have not started it in about 4 days. How do I resolve this problem

Before anyone can even begin you need to say what “will not start” means. Describe exactly what happens when you turn the key.

If your '03 still has the original battery, you are due for a new one. That’s about the best guess anyone can give with the little bit of info you have given us to work with.

A car battery loses a lot of power when it is cold, therefore a weak battery will be weaker and not have enough power to crank the starter on a very cold morning. When it warms up a bit, then it can start the car.