Hi happy Kodiaq owners!

My beastie has decided that she doesn't like something in the adblue system:

P203B00 - Reductant Level Sensor Circuit Range/Performance
            static

P208A00 - Reductant Pump "A" Control Circuit/Open
            static
P249C00 - Excessive Time To Enter Closed Loop Reductant Injection Control
            static

With there being multiple codes relating to different circuits, my initial thought is that it could be an wiring fault, rather than the pump and the sensor both being borked. Does anyone have any experience with these codes, or getting to the pump etc without dropping the tank off the car?

Ta muchly.

OK, found the tank - no chewed wires etc underneath! - is there a way to get to the top of the tank without removing the beggar? 12v on both sides of fuses 1 and 20 too - so not a 'central' electrical fault - but I bet there is a lot of wire between the fuses and the tank!