Automatic flush-valve sensor and solenoid repair parts are components for replacing the proximity sensor, solenoid actuator, and related parts of a toilet's automatic flush valve (flushometer). The sensor is an electronic mechanism that works with a solenoid to activate flushing after a set time period or once a user has moved out of sensing range. These parts are commonly used to repair sensors and solenoids that fail to trigger flushing or continuously trigger flushing.