Hey brother I had the same issue about a month ago now. I checked everything replaced sensor and relief valve and went over everything. Turns out when I moved the harness out of the way I must of pulled the hpfp wire and it came loose from the harness side. I ended up getting another harness...
Did Joseph get the problem sorted ? If so how ? As I am suffering the same fate. 2011 ms3
Hey bro did you end up getting your issue sorted. How? As I am suffering from the same issue