My jag has been runing fine no fault after 300 mile trip parked it in garage used it again no problem after use put in garage did not use it for month.so ewent to use jag started put in drive would not move forward engine wont rev put it in resverse moves fine no lights on left it runing than slow moved forward took it for drive light came on gearbox fault no gear change switch engine of than started ok no fault light runing ok but now if it lefts for few hours gearbox fault comes on car no drive takes quite a while to move than will drive ok.does any expert know what is it code is po730 and po780 need expert help. Mac

 

Welcome to the forum. If you didn't have a battery maintainer connected for the month you left it the problem is almost certainly a low or even bad battery. Charge the battery and then take the car to a auto supply store and ask them to load test the battery.

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Hello thanks for you reply.Battery is new ok no problem I phoned Jag dealer to ask they said if auto oil is old like gone brown it will cause this problem so will change oil on monday and hope for the best

 

Google changing trans fluid, there is a specific routine to follow.