So my SES Light came on and I'm showing a few codes. My scanner showed these 3: P0118, P1131 and P0172 P. I know the last 2 have to do with one of my cats, since it is effed. After looking up the codes online the P1131 says-P1131 - Lack of HO2S-11 Switch, Sensor Indicates Lean A HEGO sensor indicating lean at the end of a test is trying to correct for an over-rich condition. The test fails when the fuel control system no longer detects switching for a calibrated amount of time. The P0172 says-System too rich (bank1). I have a feeling If I get the cat replaced these will go away but what is the P0118? I know it has to do with "P0118 - ENGINE COOLANT TEMPERATURE CIRCUIT HIGH INPUT" but what does that mean? I also can't locate the sensor. Everyone seems to say its to the left of the alternator outside the engine block but that's a little vague. Could all 3 of these codes be related? I'm more concerned with the ECT code because I have no idea what it is. All my seaches on google and the stangnet forums haven't helped me. Any help you guys could offer would be greatly appreciated.