My 52plate 2litre diesel Zafira stall on me when I was driving and when I restarted it two warning lights remained on the dash and the rev were hunting and it went in to limp home mode with no rev counter working.but when I restarted the engine when it had cool down everything seems to be fine even the rev counter works and the engine revving fine.someone has told me this could be a crankshaft sensor problem the car has just had a oil change and service so any advice would be welcome. Thanks john