I have a 2000 Audi S4 and I am suddenly hearing a very loud grinding noise coming from my engine. It ran fine with no noise, I parked it went to class, and came out an hour later started it up and heard the sound. at first it sounded like a belt squeek but now its just grinding. The check engine light came on so i hooked up my CEL and i got three codes. P0300- Cyl. Misfire Detected P1136- Bank 1 Mixture Adaptation too lean P1347- Bank 2 Crank/Cam sensor out of sequence. Could any of these codes cause a grinding sound coming from the engine? Any help is appreciated.