Q7 3.6L P0174 Fixed
My Q7 is 18 year old and with 88k miles. This year my Q7 needs a smog certificate before it can be registered to drive in CA. It’s been sitting outside for a long time, I had P0174 Bank 2 Fuel Trim too lean popped up, also P0456 Evap has small leak. The gas mileage …


