Intermittent engine systems failure

[Guest]

Hello, 

i am looking for some opinions and would appreciate any help. 
a while ago i brought a 2009 jaguar xf 2.7 diesel luxury. When I purchased the car I took it back to garage under warranty to have a coolant leak fixed. Shortly after, the car would double beep when locking the doors and the alarm would go off (had a mind of its own) for no reason. Computer showing that drivers door triggered the alarm. My thinking at the time was that it was super sentivie as I live and park on a fairly busy road so thought nothing of it. On top of this, the Engine systems management light would pop up intermittently, sometimes staying on for 2 seconds and going off. Sometimes flashing on and off for about 10 mins and sometimes staying on solid for the whole journey but with no associated symptoms. I then lost my reverse camera, noticed that the rubber grommet which takes the wiring harness from the car to the boot had been messed with, opened it up and the wires were corroded so had a jaguar specialist replace the boot harness. Then had a problem with it going into ‘limp mode’ due to DSC fault. Had the EGR valves done at a jag specialist and whilst there asked for a full service and them to download a new ECU programme from jag and new battery in to try and sort the electrical fault as no codes popping up. Now, the car start stop button has a mind of its own, sometimes works, sometimes doesn’t, when it doesn’t if I go back to it a few hours later 9 times out of 10 it starts when I’ve done no interventions to try and fix it in the interim. Some people have said clocks need replacing, some people have said drivers door mechanism (can’t see this being the issue myself) and some say internal control unit but again, can’t see this being the culprit as everything else works as it should IE. Windows, lights, computer unit.

Has anyone else experienced this and what was the solution? Thank you for taking the time to read such a long winded post.

joe