Hi guys, my TPMS (tire pressure monitoring system) stopped working and I am need of help trouble shooting it. Any help with starting point is appreciated. 2009 XK. thank you

 

​​​@badicedog
You say "stopped working". What do you mean by that? What diagnostic do you see/have?
If it's just the light on the dashboard, no panic. We've all been through this.
So, there's 2 things:
Or your TPMS sensors are out of battery. then just have them replaced.
Or you have the cut wire symdrom. There's ,on the first years XK, a problem with the wire of the module running behind the bumper and getting cut by a structural piece that's extremely sharp and that ends up cutting the wire. Not a big problem... BUT it involve getting the front bumper down and that's quite a boring task...then just 2 wire soldering and that's done.

You might have both at same time . But in all case, nothing dangerous.