The Detergent Lid is an OEM part for Bosch dishwashers, designed to cover the detergent dispenser compartment. This lid ensures that dishwasher detergent is contained and released at the correct point in the wash cycle, contributing to efficient and effective cleaning.  Causes of a malfunctioning detergent lid can range from physical damage, such as cracks or warping that prevent a proper seal, to mechanical failure in the latch mechanism that prevents it from staying closed during the wash cycle.  Symptoms of a bad Detergent Lid include: Detergent not being dispensed properly during cycles Water leaking from the dispenser area Dishes not being cleaned effectively due to the detergent not releasing at the correct time This OEM Bosch part is also compatible with Thermador, Gaggenau, and some Kenmore models.Part Number 00166621 (AP2802328) replaces 166621, 423436, AH3439212, EA3439212, PS3439212, PS8697155.