2011 BMW 528i Questions

All 2011 BMW 528i Questions

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I have no blue tooth, no audio for navigation no cd because of lack of audio. How much does it cost to replace an amplifier
I bought my BMW from a dealer. while trying to use the navigation system, its asking me for a passcode. Any idea how to reset passcode for the navigation system?
This problem happened after I serviced Airconditioning system
Sometimes when I am driving, usually city-lower speed and when it is raining, the trunk of my car opens on its own. I stop and close it. It will then usually happen again a few times. Then it won't do it for a whil...