On Friday I was just driving along and my check engine light came on. I read the codes with a code reader and both those codes came up.
P0134 - O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
P0154 - O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 1)

It seems very unusual to get both of those at the same time and even more unusual that both upstream 02 sensors would fail at the same time. Does anyone have any ideas or suggestions? The car has 107k miles and is a 2004.