Hello Nigel and Welcome..My name is XXXXX XXXXX Im happy to help / advise you ..You do have to be very careful with this... It could be a sensor issue yes - even a bad connection on the command system such as the range sensor and so on - but, the first thing with such symptoms is to see if when you have the fault, you have any fault light on or flashing at all. If you do - you know there will be fault codes logged in the TCM ( Transmission control computer ) and thats the next step then.If not / no lights - then the next step is always to have the transmission fluid checked - and changed. But its condition should be always checked - if its a nice red ish colour and smells of "oil" - thats good. If its black and smells bad - burnt... thats a bad sign - a sign of internal damage in the transmission.To of course the level should be checked - if its red in colour but just low, that would be enough to cause your issues - in which case a top up would do.If its not that - then either way, the next step is a flush and change of fluid and filters - and then see how it is... that may be all it needs.If not - if you still have problems then, then you have to have a proper diagnostic done on the system - via a plug on diagnostic machine. This will check for fault codes regardless of any lights and is also capable of a full diagnostic to test the whole system - that will find the fault usually then - but - if not - then its an internal fault that is best entrusted to an Auto Transmission specialist - as they have all the test equipment / toolery and knowledge - Most garages inc dealers will send such issues to such people for those very reasons - Repairs to autos are usually considerably cheaper that way - rather than replacements.So thats the way to approach /work through this one now Nigel -
Do let me know if you need anything else at all - Kind Rgds - MIKE..>>> ..Meantime..............Please do click on the "OK/ Excellent ratings" for me as that's how Im credited for helping you - Thank you in advance for that...You can and are most welcome to get back to me anytime you might need - clicking the OK ratings does not close you out at all..Rgds, MIKE.
Thank you Mike - much appreciared.