Re: Flow sensor behavior changed after removing it
 

:) Is was the easiest thing to pull off the sensor and look if there was something broken, at least much easier than pulling out the jet and testing it. But I admit: Since I did not know exactly how the spray should look, I did not recognize the problem.

We disassembled the jet and found some debris in it - it must have entered when the water lines were unattached and open while we did some dirty mechanical work in the engine bay.

I have learned the lesson :)

Regards
Stefan

Re: Flow sensor behavior changed after removing it
 

It is reassuring to hear that as the system has two inline filters between the tank and and jet. Thanks very much to confirming that.