Can someone please shade some light on this for me. With the first snow fall and cold weather in Toronto my A4 started acting up all day today. When i scanned it these are the codes it showes:

16684-P0300-Random/Multiple Cylinder Misfire Detected
16686-P0302-Cyl.2 Misfire Detected
16688-P0304-Cyl.4 Misfire Detected

16825-P0441-EVAP Emission Contr.Sys.Incorrect Purge Flow
16891-P0507-Idle Control System Higher than Expected

Is it serious?? and ideas??

 

There are many reasons for this but it Looks like your coil packs might be acting up, but too early to say, i would clear them and see if they come back

 

16825 is fairly common during ambient temp changes especially when going below freezing. Best to clear the codes and monitor how fast / often they return. If recurs regularly then may need to test / replace N80 Purge Valve unless purge lines are plugged.

The misfires are a separate issue that should be addressed asap.

 

is your check engine light stay on? I had this twice before, misfires, then check engine light on and stays on. But after the engine warmed up a bit the car drives fine. After a long(30 mins) drive the check engine light would go away on its own.