Amarok Tdi prende rulo y pierde fuerza

In the case of Amaroks, when there is any engine failure, the spark plug indicator light flashes and then the yellow light appears on the dashboard. In this case, when scanning it, it shows a lack of fuel pressure. As a first step, I changed the filter and it still had low pressure when applying it at low revs. The cause is the valve that controls the variable pressure in the ramp and return. It can be cleaned using ultrasound and tested or replaced, always respecting the kilos of torque when installing it.