Fuel rail pressure sensor

[tamarisk]

Ongoing issues with starting and getting P0089 Fuel pressure regulator performance code.
Have replaced said regulator, has been starting fine the last few times of trying, thought issue was solved and then it happened again, turns over but no start,
Having researched online, seems that possible issue is the fuel rail pressure sensor.
Haynes manual says that it shouldn't be removed.
Is there any reason for this?
I was hoping to test the connector plug to make sure all is well but can't get purchase to pull plug off, so was hoping to remove complete sensor and test and replace as needed,