Q: Running lean on bank 2

Hello and thanks for writing in. Code P0174 relates to a lean fuel condition which is typically caused by a faulty mass air flow sensor or potentially a vacuum leak beyond the mass air flow sensor causing the reading of the mass air flow sensor to be inaccurate. The mass air flow sensor reads air intake as it is mixed with fuel prior to being injected into the motor. This information is then sent to the ECM which uses this to make adjustments to fuel supply to the motor. A dirty or faulty sensor can cause an imbalanced air/fuel load to be supplied to the motor which results in an over fueling or under fueling situation depending on the conditions. In your case, it is causing a lean condition which means the ECM is not supplying enough fuel to the motor. I would suggest having a professional from Your Mechanic come to your home to diagnose and inspect your vehicle.