Glad to hear you're all up and running again, worthwhile clearing that fault code for the furure - if something else happens and someone plugs in a reader it will show up and probably give a red herring to the diagnosis.

Hello Jim,  Thanks for your Bagworld information , I will give them a buzz.  Regards richard

Just wanted to say thanks to everyone on this thread and add a few pics of the old and new part, together with the fault code that I had on my cheap ODB car scanner app. You could probably do everything with the front wheel off and the wheel liner pushed out of the way.  I did take the air box out first but there is no way to get the part out from the top.  It did give a me a bit more light to work, especially as the wiring and harness clips were a pain to remove. The fault code cleared by itself after I started the car with the new part.

Is it just the satnav that's inoperative? If yes, then the likely culprit is the disc player in the boot. However, the system is so out of date that it is almost pointless to try and get a repair, unless of course you are seeking to keep originality. There is an option on the 4.2 litre engined cars to have an upgrade to allow Apple CarPlay / Android Auto hooked up, which gives you all of the advantages of phone mirroring, Google Maps, Waze, etc. It's more convoluted in the 5.0 litre engined cars - it can be done, but more complex. Check out systems like Mr 12Volt and Cartronics. Come back here if you need more steer. N6 JMX

I have taken my XK to 3 garages so far, 2 of them Jaguar specialists, to see if they could repair the sat nav or somehow get it working again, but I have had no luck at all.  Does anybody know where I could go next to resolve the problem or is there a spare sat nav out there?  My understanding is they are no longer made for the XK and so it has to be a complete sat nav/electrical refit.