It started with the battery light coming on then the red over heat light came on. when i opened up the hood the water resuvouer cap had pop open i added more coolant and closed it but still was over heating.
where should I start with a p0117 code i was thinking with the thermostat. on 2004 Scion xB
START WITH IS THE CAR OVERHEATING, THEN CK COOLANT TEMP SENSOR WIRING AND SENSOR. ITS TELLING YOU THERE IS A PROBLEM WITH THE CIRCUIT NOT NECESSARYILY THE SENSOR