CEL came on and went to Advanced and was given the P0031 code. Bought a "universal" Bosch sensor on-lline. Had a buddy install it and he had mechanic double check the wiring was done correctly.
Now it is giving P0031 and P0037 (Rear 02 Sensor) CEL's. Since Advance did the original read I'm not postive there weren't two codes there to start with but don't know for sure.
Went through the forums and found one similar case where a wire was cut but that doesn't seem to be the case here. Anyone have any diagnostic tips/thoughts?