I have 2 keys for my 2001 4.4 X5. The one key works fine everytime I use it..locks, trunk, starting car. My spare key all of a sudden wont start the car everytime. If I start it with the first key and turn the car off and insert key 2, it will start with no issue. Turn the car off and wait a min or 2 and try and start it with key 2, everything in the car comes on but it wont start the car. Any help is greatly appreciated.