my jeep has a code reading temp. sensor high input. well the gauge was not working so i looked and the new head i got did not have a jacket for the sensor so i ran it into the senor attached to the thermostat housing now the gauge works great but the code is still there! my obd2 will not delete it and i tried unplugging the battery and it is still there? any way i can get it off i need to sell it but don't want to sell it with the check engine light on? please help thanks,Alex