Hi I have a 2009 g37x coupe and I got home last night and shut my car off then tried starting it again and it wouldn’t start so I put it on the battery charger and waited an hour and went to start it and it started right up as normal but my service engine light was on and there was a noticeable knocking noise in the engine and if it was at idle it was quieter but when you rev the car it gets a lot louder was wondering if I could have some advice as to what this could be?