Twice now I have had the EPC light illuminate and max 4000 rpm come up on the S4.

It clears when you restart the car, and each time i've scanned it it says its an unknown fault code. It seemed to at both times come on when giving the car a bit of stick and when it changed at max rpms at the redline.

Google says oil pressure switch, as does a few posts on here.

Any of you guys got the part number of the switch that was replaced so I can find it and replace it. My car is no longer under warranty so figure i'll be doing the job myself.