“The two items may be related - unstable 12 volt power caused by a crappy, old battery. But what I find disturbing here is your "trip to the dealer" remark.

Unless you need the TPMS modules reprogrammed, NOTHING warrants a trip to the dealer.

If you are just going to take the car to the dealer, you don't need us, you need a bottomless pit of money and time.”

It appears that you have recently purchased your XF and joined this forum which contains a wealth of information. Welcome. There are individuals who contribute to this forum whose knowledge and experience are unequalled.

To properly diagnose your car’s issue(s) more information will need to be obtained. Check out the link ala-xfire provided and see if there are any codes that can be read.

As a member of this forum you are now part of “us”. There may be rare instances in which you might need to take your car to a dealer. As an example I recently had to have my skreem module replaced in one of my Crossfires and a DRB III was need for reprogramming. As part of “us” the forum may help you solve the hiccup your car experienced and as “us” the knowledge that diagnosis and solves your car’s issue will be helpful to other forum members. Meaning the rest of “us”.

Again, welcome to this forum and your willingness to join “us” and to seek information on your new Crossfire.