For 09D1 door mirror issues, cleaning the electrical connectors with electrical cleaner often helps. If not, the mechanism sensor may need replacement.

If the suspension is stuck in a low or high position, check the rear height sensor and its wiring.

Issues with the engine management fuse box.

09D1 is often paired with 09D0, indicating a short circuit to earth or positive on the driver or passenger door mirror sensors.

Run a full OBD2 scan to see if 09D1 is accompanied by other faults (e.g., injector circuit codes or BSI codes).

Wiring harness issues at the injectors.