Docsuby

Hi folks!! Just bought my first Audi (2001 A6) 130k on the mileage. Have owned subaru's to this point. Obviously this is not a new car, and I know this is a subject that has been discussed before, but I can't find a thread. My car is throwing lean bank codes for both banks (1 & 2). I'm thinking this is an 02 sensor? Also getting a burnt oil smell when the car is sitting. I understand that these motors (2.7) have a habit of eating valve cover gaskets? Thanks in advance!!