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Hi--Could be a battery problem ---how old is your battery.????

Agree with John, but as Jim says the TPMS is probably separate so it could be a below-par battery. As you can get a battery test for free there's no harm in doing that first.

Hi If you are getting 12.4 v on a cigarette lighter socket voltmeter with the car unlocked but not running the true resting voltage is probs 12.8v (fully charged). As soon as you unlock the car (and enable the socket) the car is drawing around 4 Amps and voltage drops significantly. As mentioned before, if S/S works battery is fine. I would be looking at an ABS wheel sensor as cause, along with a fault in the TPMS which luckily I don't have as they are very tempremental. One approach to sorting the TPMS is to over-inflate the tyres and then reduce pressures back to normal. If that does not work it is most likely a wheel Tyre pressure sender at fault. Systems like traction control rely on knowing how fast each wheel is turning, so a faulty ABS wheel sensor (which is what measures each wheels speed) will generate a fault which forces other functions that rely on its input to fail and throw a warning light so you know that function is not available. A failed parking sensor will switch off the reversing camera as well and alert you that you are "on your own" as there is a fault so don't blame us if you hit something when reversing! Good luck John

Also I and other owners have had Turbo actuator problems,affecting acceleration seems common.but easy enough to remedy The car should be stable round corners. If it wobbles- needs radius arm on rear suspension

Hi Matthew, Welcome to Jaguar Owners Club. X type, nice car to drive, and comfortable Check for rust on sills. Door latches / central locking connection to key fob can have problems, mine did but was easily solved. The later models more reliable in general. Kind Regards, Julie.