All who were there yesterday know what these codes mean. I have been researching and the cause is least likely to be the O2 sensors themselves. According to Keith these were just recently changed. Here is a cut and paste with some info.
P1131 Lack Of HO2S1 Switches, Lean (Bank 1, Sensor 1)
P1137 Lack Of HO2S1 Switches, Lean (Bank 1, Sensor 2)
These codes usually do not indicate a problem with the O2 sensor. Rather, the O2 sensor is correcting rich due to an overly lean air/fuel ratio. Check Base Engine Idle, EGR, Fuel System and Air Induction System.
Apparently the usual cause of these codes is either low fuel pressure, dirty MAF sensor or a vacuum leak. Often when major changes are made these codes will come on and then go away when the car has had time to make the necessary adjustments. If either one of these codes had appeared on it's own we could be suspect of a O2 sesor. Due to the nature of our meet yestesday and the carnage we caused
or removed it is safe to say the O2 sensors are still good.
