Hi- I have a 2009 Q5 and was getting multiple misfire codes. I took a stab at the problem and replaced all the spark plus and all the coil packs. It drove great for a few miles then started throwing codes again and the EPC light came back on. I got the 3 listed above in stored codes (p0301 p0300 p0303) and I also have pending codes of p0491 and p0492.

A few other pieces of info- The EPC light came on a couple months ago (i assume same problem) but then went away by itself the next start of the car. Then it did it again a couple weeks ago and again went away. Now it comes on and throws codes every time. So I assume it is something failing and not lack of compression in a cylinder or something like that.

Also, there was a lot of oil in the spark plug wells of cylinder #2 and #5 from a leaking valve cover gasket. Not sure if that has anything to do with it.

Any help would be greatly appreciated. My next guess would be the ICM but I'd like to avoid just throwing more parts at it. Thank you!