Malfunction Indicator Lamp & P0345 & P0456 Codes
 

Hey!!

I recently got Malfunction Indicator Lamp (MIL) on for my 2004 Audi A6 (140500 miles). I went to an Autozone and read the following codes (P0345 & P0456).

I don't have much experience. Are these two codes related? Where should I start fixing them?

I checked the fuel cap several times already. The light didn't went off. Do I need to reset the light?