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There is a chance that your temp sensor is the culprit on both codes. The temperature sensor is what tells the ECU how hot or cool the engine is and weather or not to keep the engine in phase lock loop, or choke, mode. If the engine stays in phase lock it will run too rich and the O2 sensor will not be able to compensate.
You would need a scanner and an inferred temp sensor to troubleshoot the system. You need to know what the actual engine temp is, and what the temp sensor is telling the computer. If and when the engine reaches 220 degrees, the engine temp sensor should be sending that data to the computer and it should ground the fan relay to activate it. Unplugging the sensor and having the fan run tells you the sensor is connected, and there should have been a trouble code set at that time. It is possible the coolant level is low, or something else preventing the temp sensor sending the correct data.
If you have Code 15, you need a volt meter or you will run into a wall. You measure the coolant resistor ohms when its cold then measure it when the engine is warm.You also have to measure one side for a 5 volt reference.Or better yet when the vehicle reaches operating temperature and begins to stall take the leads of the coolant temperature and jump it together.This tell the ECM your temperature is 266F. If its stays running and doest stall replace temp sensor
What you have is a bad sensor or possibly the EGR valve . At this point what you should do is take the vehicle to an auto parts store if you don't have a code reader . They will read the code for free for you and that will tell you witch sensor or emissions related part is giveing you the problem.Most sensors are vary easly replaced some you don't need tools but tend to be somewhat expensive so you don't want to blindly start replaceing sensors The OBD 11 system you have in your vehicle is vary good with reading codes and idenifying the correct sensor the problem is one sensor affects another sometimes so you may have to go back twice if the light comes back on depending on what is wrong . Sensors range 30 dollars to about 200 but most you could replace your self and save the shop bill Good luck with it its probabaly nothing realy bad and will run a lot better when you find the cause and replace it
is your vehicle automat climate control ? suspect the tempreture sensor in the vehicle is defective and is not giving a true reading of the relationship between the set tempreture and the true air tempreture.
Same car, same problem. Press MODE, FRONT and REAR buttons together to reset tempreture. You probably need to replace the sensor GM part number 15047946 it is in the front grill email me for a picture. email@example.com
hi john , sure sounds like you may have unplugged the coolant temp
sensor or didn't get a good connection at the sensor , location , in
between two exhaust ports on the side of the engine that has the oil
fill and pcv .