Engine Cutting out

[Rick j]

 Hi I have a 2011 xf, been no bother till now! 
had a parking sensor go off and the car would just shut its self off while driving,, , got the sensor fix but the car is still shutting it’s self off occasionally. Been back to the garage and they can’t find any thing wrong!  Don’t know where to go from here as very stressful while driving.. been out yesterday and done 35 miles and all ok, but today done 10 miles and it cut out everything stops but started up straight away?

Any help would be appreciated?

[LairdScooby]

Friend of mine had this on a Merc recently, turned out to be throttle switch giving a false idle situation to the ECU - might be worth looking at.

The logic behind it was you don't want the engine revving when you're meant to be at idle or braking etc.