I have tried all the fixes (including disconnecting the pre-heater and battery) and I’ve been to the garage to have a new external temperature sensor fitted.

I still have the same problem with my XF 2014. My external temperature sensor works intermittently, often staying in working or failed mode for a few days at a time.

On the central control panel, I get _o_ for the temperature reading. On the dashboard with the speedometer it always shows 0°.

The consequence of all this is that nothing temperature related will work. Fans, demisters, heated seats etc.. It’s an absolute nightmare because the windows mist up and I have to keep the windows down to ventilate the car. I’ve got a fan on order from Amazon until I can get this resolved.

Everything was working fine when it went to the garage and they replaced the external temperature sensor. They ran diagnostics, but there wasn’t anything showing in the history.

It’ll go back to the garage next week for more investigation. Does anybody have any suggestions? I’m thinking it might be a poor connection with the wiring somewhere, but no idea how they get to the bottom of that without it costing a fortune.
Thanks