Thanks for the reply. I've replaced the battery several times with new ones ( I should have mentioned that in the post) and unfortunately I lost the other fob. I've been procrastinating replacing it due to the cost. So I guess the next step is the scan tool. I'll let you know what I find out. Thanks.
I have a 2010 750 LiX with a continuous dash display that says I need to replace the battery in the key fob. Sometimes the engine won't start or stop unless I hold the fob against the steering wheel. Any thoughts?