I have a 2011 Jaguar XF supercharged I’m getting fault codes u0122, u101b, and historic faults of u0001 abd u0100. Any help? I’m lost brand new agm battery and I just replaced the rear cross over tube.

 

All of these are can bus communications issues, the ECU, ABS & TCM aren't talking to each other. Its not going to go anywhere without that working.

Looks like you've probably got a fault on the bus somewhere, or a faulty module interfering with the bus.

I'd start by disconnecting the battery and checking the wiring connection at the ECU, might also be worth checking anything electrical near where the recent work has been done on the cross over tube. Check the connectors are clean and seating correctly. Test for a short to ground or open circuit on the can and that the ECU has 120ohm resistance needed to terminate the can bus.

If you can get SDD to talk to anything it might give you more details about which modules are struggling to communicate and where the fault might be,

 

Disturbed some wiring while replacing either the coolant pipe or battery perhaps, or the battery wasn't fully charged.