Methods of finding out if the O2 sensor or temp sensor is be

Methods of finding out if the O2 sensor or temp sensor is because a car to run too rich?

Be cautious if you are troubleshooting with fault codes from the computer. I am guessing this because your asking if either is making the engine run rich. I had different fault codes on my truck and the O2 Sensor and Temp Sensor fault codes were two of them. I replaced and replaced sensors, about $250 worth, and it turned out to be my fuel pump. One shop told me it was the intake manifold that could have cost me $800 to change out....Idiots.