Toyota Proace tyre pressure light coming on randomly

It's something you will have to pursue with Toyota to resolve under warranty . Common cause is a faulty tyre valve sensor that can be on any wheel / tyre , on some vehicles it indicates what tyre is low .

Thanks they're telling me all sensors OK!

If it's an intermittent fault , very hard to diagnose unless you can take the car into them when the fault is showing to allow them to scan for fault but not always possible . Record the fault , show them it and then down to them to find the answer

Yes I think I'll try another Toyota dealership. There are no individual tyre sensors apparently.

" There are no individual tyre sensors " Every wheel/ tyre has it's own sensor .That is why on different makes it shows all four tyre pressure on screen and you can see if it is the same tyre all the time that is triggering the warning .

Thank you will record next few times it happens and show them your post

Confirmation if needed there are 4 sensors

Toyota Proacehttps://www.ebay.co.uk/p/2115988423