BMW Questions? Ask a BMW Repair Expert for Answers.
hi sorry for the delay. what exactly does the car do when you try to start it? does it turn over but not fire? does it just make clicking noises? does it do nothing at all?
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there are a lot of different things that can cause this as there are a number of dependencies that must be met before the car will start - key must be present, trans must be in park or neutral and sending the correct signal that it is, immobilizer must be working, foot must be on brake and signal sent confirming this, etc.
so, your issue could be any of these items playing up intermittently. However, I would suspect most likely that you are experiencing early signs of starter failure. The starters are notorious on the engine that you have in your X3 and if it is original you are due for a replacement.
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