Drove the car about 80k last night. WOW does it run a load smoother. Talking to another 2.7 HDi owner last night and he said that cleaning this sensor is standard practice.
Job involves lifting/pulling the engine cover off, unscrew one self-tapper, pull the sensor out with your fingers (Fitted with an "O" ring), I sprayed the sensor with some electrical cleaner. After it dries push the sensor back in and put the screw and cover back.
Good pictures, but I am unclear as to which sensor this is and whether the pictures show a before or an after situation. No wish to be obtuse but I am struggling with other oil problems on my 407HDI COUPE and almost desperate for help. I have just replaced my oil pressure sensor and not improved my situation at all.