Sleep Sensor (Hall Effect) Flex Cable for MacBook Air 13.6″ (Model A2681, 2022, M2)

Genuine Apple sleep/wake sensor flex cable (Hall effect sensor) for MacBook Air 13.6″ (Model A2681, 2022, M2)—ensures automatic display sleep when the lid is closed and wake-on-open functionality. OEM part number 821-04129-02.
Compatible With: MacBook Air 13.6-inch (2022, Model A2681) with Apple M2 chip (all colors: Silver, Space Gray, Starlight, Midnight).
Apple Part Number: 821-04129-02 (exact OEM service part).
Function: Contains the Hall effect sensor that detects the magnet in the MacBook Air’s display lid. This allows macOS to: Sleep the system when the lid is closed Wake instantly when opened Prevent false sleep/wake events during use
Sleep the system when the lid is closed
Wake instantly when opened
Prevent false sleep/wake events during use
Location: Mounted near the right side of the keyboard, adjacent to the battery and logic board.
Common Failure Symptoms: MacBook doesn’t sleep when lid is closed MacBook wakes randomly in a bag “Lid closed” not recognized in macOS Requires manual sleep or power button use
MacBook doesn’t sleep when lid is closed
MacBook wakes randomly in a bag
“Lid closed” not recognized in macOS
Requires manual sleep or power button use
Part Type: Flex cable with integrated Hall sensor—not just a cable, but a calibrated magnetic sensor module.
Installation Note: Requires full bottom case removal and careful disconnection of the battery. The sensor is adhered near the I/O area—do not bend or puncture. Recommended for experienced technicians.