I realize that the code I show in here could be any number of issues, but I felt that, for me, it was cheap and easy enough to take a shot and see if my issue was the upstream o2 sensor. The sensor ...

A 2008 Chevy Avalanche (Figure 1), with a 5.3 liter automatic engine, was setting codes P0172 and P0175 (System rich, banks 1 and 2). This vehicle, which had 94,000 on the odometer, had this problem ...