The detergent dispenser in your dishwasher stores the detergent until it is ready to be dispensed. If your dishes are not coming clean, or you notice the detergent is still in the dispenser at the end of the cycle, you may have a damaged or malfunctioning detergent dispenser. This detergent dispenser is not sold with a sensor. It is gray in color and is sold individually. This is an OEM part sourced directly from the manufacturer.