Hello all, I have a 2007 S4 with 148,000 miles and recently I've been having trouble starting the car. It will crank about 3 seconds then finally start and not have any problems or stall while driving. Now the past 2 days it hasn't been starting at all, even after 30 mins of trying to start it. My code reader says P0171, P0174, and P0322. Is there a way to be sure it's just the crankshaft position sensor or not something with fuel delivery or spark? Would appreciate any help!