Fault codes

[Ktaylor]

Anyone help with these faults for a 2006 1.8 tdci Ford focus. Car wouldn't start immobiliser fault because fast blinking red light thanks in advance
P1260-21
U0422-a1
B1681-20
U1900-20

[denbo]

Have you tried another key?

[Ktaylor]

Yes 2 keys worked fine yesterday had sleep come to start and pats code 22 and the codes I mentioned in forscan

[denbo]

This could be a bad battery. If they worked the day before, then something has changed. A bad battery is where i would start.