fail safe mode came on car want start. Then started after 5 mins.

Hello, Have the vehicle scanned for OBD-2 trouble codes, and let's see what is going on. If you do not have a code reader, most auto parts stores will read them for free. If you would rather have it diagnosed be a certified repair facility, see here: https://repairpal.com/jaguar-within-10-miles-of-kansas-city-missouri-64133 If you would like an estimate on diagnostic work, select this link here: https://repairpal.com/estimator/jaguar/xj8