I've started experiencing a rough idle (engine is shaking quite a bit and the revs bounce around a little) on my A3 and decided to scan it to see what error codes I got. I got the following error codes 18010 00561 16486 Now with some searching around on google I found that these error codes can cause a rough idle (not so much 18010). The modifications I have on my car are as follows; Front mount intercooler with new piping (I have tested and found 1 boost leak which I fixed but I will retest on the weekend) New silicone turbo intake pipe, fairly sure this has no leaks, it is very hard to see where the TIP joins the turbo but it is hose clamped on pretty tight Pod air filter, I have read that the oil's on these pod filters can affect the MAF sensor? I'd appreciate if anyone gave me the order in which they would check issues potentially causing these error codes depending on which is more likely to be resulting in the rough idle, ie clean maf, check for leaks, change spark plugs, clean injectors. Thanks!