Help with OBD Codes

[tjcin1]

I just had my 06 X5 in to the dealer for a fuel guage level problem. The guage would only go to 3/4 even when the tank is full. They replaced the sensors and the pump. Less than 50 miles from the dealer, the SES light came on. I have an OBD2 scan tool so I checked it. It came up with 2 codes, P0461 and P1419. One relates to a fuel sensor and the other to an emissions problem. Anyone have any experience with these codes and what it takes to correct them. It's just hard to trust a dealer. I would like to be an informed owner before I bring it back to the dealer. Thanks ahead of time. Tim C