One of my keys opens the car and powers up the dash,....but wont start it.

[bcolins]

One of my two keys will not start my 04 E83 X3. It unlocks it, and when I insert it into the ignition and turn it to on,....the dash and all electronics power up,...but when I turn the key to start,.....nothing happens. If I use my other key,....it starts right up.

Anyone have any suggestions on what is going on with the key that is not starting my X3?

Brian

[bcolins]

Anyone experienced this?

[yes_its_neil]

You can try this re-synchronizing procedure, remember to do it for your working key as well at the same time, otherwise it will not work afterwards. In other words, do both keys with the same process, follow the second key straight after the first. I have done it in the past for my X5 when I bought a replacement key.

https://www.youtube.com/watch?v=aje2eoDg5v8

[bcolins]

Originally Posted by yes_its_neil

You can try this re-synchronizing procedure, remember to do it for your working key as well at the same time, otherwise it not work afterwards. In other words, do both keys with the same process, follow the second key straight after the first. I have done it in the past for my X5 when I bought a replacement key.

https://www.youtube.com/watch?v=aje2eoDg5v8

Tried this,....my original key stopped working,....got it working again,....just noticed your mention of this,....so going to try it again.

Thanks Neil.

[scottjoh]

Originally Posted by yes_its_neil

You can try this re-synchronizing procedure, remember to do it for your working key as well at the same time, otherwise it will not work afterwards. In other words, do both keys with the same process, follow the second key straight after the first. I have done it in the past for my X5 when I bought a replacement key.

This does not have anything to do with being able to start the engine. That is only for the keyless entry system and again has nothing to do with the starting of the engine.

The key is bad and needs to be repaired or you need to buy a new one from BMW. I've seen and repaired many of these diamond keys with starting problems.