Greetings, The EPC light on my 2011 A4 periodically lights up and the car begins to perform poorly. Typically the light stays on a couple of days before I can get it to the dealer to check, and then the light shuts off. Tonight I managed to use my Carista app to get the VAG fault code 04816, but I see no reference to the meaning of the code online or otherwise. Anyone know what this code corresponds to? Thanks!