So I have a 2008 ms3 completely stock, had an engine covered by a warranty put in and since then I’ve been getting p0300 codes and now my service light is interchanging with the engine light.. sounds weird partially think wiring could be a issue at this point. Maybe head gasket. Idles regular started whistling… (if it is a vacuum leak then it can’t be too major because it runs and idles no problem where it should) but the whistle wasn’t there before my last oil change also checked my air box filter and it wasn’t too bad looked pretty clean. I’ve had the coils, plugs, and injectors changed out still getting my p0300 occasionally mostly when at an idle. As for the service light the only other things I could think of is fluids being low? But they are all at acceptable levels.. really lost and it’s at the worst time possible too so any insights would be amazing