I get message "Front assist and acc not available" very often now. When the car is restarted, it is OK for a while. This has been going on for a while, but now it happens almost every time I drive, whatever the weather. Sees no damage to sensor or camera. Have also had the car checked. They found some dirt by the sensor in the window which they removed. Unfortunately, this did not resolve the issue. Does anyone know what this could be and is there anything I can do to reset it? For example, by disconnecting the battery. I will try to prevent the replacement of the sensor since it has exceeded the warranty. Thanks in advance for any answers.

You can reset the alignment via obdeleven. You then have to go on a 20 mile drive with traffic so it can recalibrate.

 

This is going to sound a bit stupid, but I'm sure I had this error (among a few others) last winter when I hadn't used the car for a while because of lockdown etc... and basically just charging my battery solved every single error. To be fair to my local Skoda dealer, I phoned them up and described the sudden weird collection of errors so I could book it in for them to look at, and they said straight away just charge your battery. They said when your battery voltage gets too low, the car disables certain non-essential features to try and preserve the battery life, so yeah might be worth giving your battery a charge before you look into it any further 

Yes - general rule of VW cars - if you start getting random error messages, it will be because of low battery situations.  The CANBUS network cannot operate in low battery situations, so get the battery topped up.

 

This is what I use - https://www.ebay.co.uk/itm/233409015194 to keep my battery nicely charged.