Pegaso 745 adblue filling issues

I suspect you may have a faulty sensor. In your place I’d get it checked. 

We had a similar problem with our car warning light came on for adblue but tank was full took it to mechanic  and they put it on machine to cut long story short had to have adblue tank replaced and it wasn’t cheap 😩

I’ve had problems with the adblue container spout failing to open the gate in the adblue tank. Initially I had to decant the 10 litre containers into 3.5 litre containers as the smaller bottle seemed to have a better nozzle.  I now use a garage forecourt pump. It always opens the gate, it’s  quicker, cheaper and no spillage or mess.

My experience exactly. As Ad-blue is fairly readily available on forecourts I don't carry it or have any at home nowadays, but in the early days I found it necessary to buy a small special top-up bottle which I filled from a 10 litre. However I wasn't entirely happy with that process less dirt of contamination wad introduced in the decanting process. 

Hi , we have had same issues took it to a Fiat dealer and £180 later he said put hole in container to allow air out.I was not happy with outcome but there are issues with design with pipe issues not having a proper fall for add blue to fill.