ECM Trouble Code Is it Trouble?

I got an ECM Trouble Code, somtimes get this one at wierd times, its code 45 Which means Rich Exhaust, I dont think the oxygen sensor is old but might it be time for replacment, i just had an inspection and the first time it didnt pass the emission but a little margain. I know that it either has to be the O2 Sensor or My Temp Sensor because the sensor to the Temp gauge inside the car is not working.


93 Chevy Lumina Euro 3.1 V6
4T60-E Tranny

check your temp sensor connector and see if its loose, then measure voltage at the sensor, should be 5 volts. if you have voltage then it most likely is your sensor but i think you have 2 temp. sensors, make sure you have the right one.