WARNING: This page is about a different car, the 2025 BMW M4, 2024 BMW M4, 2023 BMW M4, 2022 BMW M4, and 2021 BMW M4. However, it is still accessible from the selected car via links, so may be relevant.
Check the detents (2) and replace the radome as needed.
The detents must not be damaged or missing.
Mount the radome (1) on the ACC sensor (3) and engage it.