|
Before the 15 mins does the car crank and try to start or just nothing happens when you turn the key?
The battery in the key just powers the remote functions (lock/unlock/pop the trunk). There is a separate transponder that tell's the car's immobilizer it's ok to start that doesn't require a battery.
The fact that jumping it makes a difference does make it seem like an electrical issue. Many BMWs won't start if the battery voltage is just a little too low. What's the voltage on the battery when the car is off and what's the voltage when you try to start it? Even though your battery is brand new it might be worth getting it tested in case it's bad. If so should be warrantied. It's also possible you have some sort of parasitic drain or something that's messing with the battery.
Also instead of taking it to the dealer there are a some extremely competent 3rd party BMW repair shops (or just euro car repair shops) have lower labor rates. In fact with older cars like ours I sometimes trust them more than the dealer where technicians may have only been trained on newer cars.
|