I need to trick a fluid sensor to return a full signal

[hhoarder]

My car has an AdBlue fluid sensor that isn't working properly. It's an ultrasonic sensor and the car is reading 0mm of fluid from the sensor (out of maximum 245mm), despite the tank being full. A replacement part is only deliverable in July or so, which basically turns my car into a brick until then. My only hope is somehow tricking the sensor/car into reading the tank as being full.

I don't know exactly what kind of output the sensor is producing, but looking online at various ultrasonic sensors, they all seem to output 4-20mA.

Here is the wiring diagram for the sensor:

As you can see, the sensor uses 3 wires - positive, negative and signal.

My question is, how would I go about using the signal wire to send back "tank full" signal to the car?

Any help or tips are much appreciated, thank you!

Edit: after doing some more research, I've found that the module in question is Bosch Denoxtronic 5.

 

[alec_t]

From page 3 of this pdf it looks as though the sensor might be one which puts out an analogue voltage representing fluid level.

 

[ZipZapOuch]

Again,
What model, year and engine is this vehicle?

 

[hhoarder]

From page 3 of this pdf it looks as though the sensor might be one which puts out an analogue voltage representing fluid level.

I've seen that PDF before, but it looks like a different system than what I have (even different car brand). My initial hope was that it is indeed as easy as sending back 5V.

 

[hhoarder]

Again,
What model, year and engine is this vehicle?

Mercedes V250, year 2014.

 

[hhoarder]

Happy update - I've replaced the old tank with a used eBay one and the error went away in 10 seconds after filling it. So it was definitely a failed level sensor that was causing the issue. Hopefully the used one will last at least a few more years as I'm sure this will eventually come back. At least I know how to replace it now

Thank you to everyone who's tried to help me with various ideas!