Lane assist currently unavailable

[Shiftless]

Hi all,

When driving today I started to see "Lane assist currently unavailable" and "Traffic assist currently unavailable". Some searching shows that these are commonly caused by dirt on the various sensors. I was driving on a clear sunny day, but nonetheless I have cleaned the VW badge and the camera area at top of windscreen, but the error has not cleared. I have some doubts as to where the sensors are located on the car (late 2019 facelift B8)? Anyone sure?

I have been using these features recently, so they have been working fine. As I understand, the Traffic assist depends on the Lane assist, so I guess there is only one fault.

Also are these warnings self clearing if the obstruction has gone, or do I need to reset? I don't have an OBD reader tool (though I think I should get one!).

Thanks for any tips