It does not matter how far between braking, on the third time Fail Safe lights.
Why does my jag go into "Fail Safe" mode after stepping on brakes 3 times? on 1998 Jaguar XJ8
sensor issues. get a diagnostic run.
I had the diagnostic done and it only showed my need for a coolant sensor. which is my next question.
you may need to get the computer reprogrammed. check out autoanything com. look up engine programmers. they will have various products for you look at that will let you do this yourself. they will also supply consumer reports on such products.