HOW TO CHANGE TEMP SENSOR SUBARU LEGACY - YouTube Click to view on Bing5:42How to Test and Replace an Engine Coolant Temperature Sensor P0115 / P0125 - Duration: 6:42. Adding Coolant the SUBARU way - Duration: 10:49. Miles Fox 147,685 views. 10:49.Author: BASSREBEL78Views: 126K Engine Coolant Temperature Sensor P0117 / P0118 | How to Click to view on Bing7:57In this video I go through the steps on determining why you may have codes p0117 or p0118. It's easy enough that any one can perform at home. This was performed on a 2010 Subaru Impreza non-turboAuthor: CarsNToysViews: 310K how to diagnose a bad temp sensor? | Subaru Outback Forums It's possible that the engine coolant temperature sensor has become too sensitive, and is triggering the fans to come on a bit too early. But they are coming on pretty close to the normal point so there isn't a strong case to suspect the sensor. Coolant temperature sensor location | Subaru Outback Forums One interpretation of the sensor impact is that problematic engine operation when cold, but not when warmed up, could be caused by the coolant temperature signal being too high when the engine is cold; e.g.,, the engine might be at 20 C, but the sensor is signalling 85 C. Diagnosing a Bad Coolant Temperature Sensor - 1990 to A bad coolant temperature sensor is something that is really easy to diagnose without using a multimeter. If a warm car continues to turn over and not start (assuming everything else is working correctly), the coolant temperature sensor is the culprit.