The BC3Z-5J225-L Reductant Fluid Level Sensor is an essential part of your Ford Powerstroke's emission control system. This sensor monitors the level of reductant fluid in your tank and sends a signal to the engine control module to adjust the amount of fluid injected into the exhaust stream. A properly functioning fluid level sensor is critical to keeping your Powerstroke running clean and efficient. If your reductant fluid level sensor stops working, it could lead to increased emissions and decreased fuel economy. Replacing your reductant fluid level sensor with a new one from Ford will help ensure that your Powerstroke continues to run at its best.