Posts Tagged: open loop

P0125

Fix code P0125 Insufficient Coolant Temperature For Closed Loop Fuel Control When you start a cold engine, the computer runs off of factory programming and ignores input from the sensors. This is called Open Loop. As the engine warms up to operating temperature, the computer switches to Closed Loop, where it computes air/fuel mixtures based on actual engine conditions. When you get this code, it can mean you have a bad thermostat or low coolant(engine not heating up to operating temp), or a bad engine coolant temperature sensor. See the … Read More