Citroen C4 Picasso Pressure Solenoid DTC Issue

Hello, guys,

I have a Citroen Picasso
VIN: VF7 3DBHY6GJ541969
Error code: P154A

I have a fault code for the oil pressure regulator solenoid, but I can´t find it in the engine, could anyone point me in the correct direction please?

A scheme of the part location would be very nice.
( I'm in a hurry)
Kind Regards