diff --git a/AGENTS.md b/AGENTS.md
index d16ee53..5b83564 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -107,3 +107,11 @@ Generated protobuf files live in `tesla/vehicle/proto/` and are excluded from ru
 - **Enums**: Custom `StrEnum`/`IntEnum` in `const.py` (not stdlib). `Region` is a `Literal["na", "eu", "cn"]`, not an enum.
 - **Seat indexing gotcha**: two distinct seat enums with different conventions. `Seat` is **0-indexed** (`FRONT_LEFT=0`) and is for the manual seat heater/cooler paths (`remote_seat_heater_request`, `remote_seat_cooler_request`). `AutoSeat` is **1-indexed** (`FRONT_LEFT=1`, `FRONT_RIGHT=2`) and is the correct type for `remote_auto_seat_climate_request` on **both** backends — its values equal Tesla's REST wire values and the proto `AutoSeatPosition_*` enum. Don't mix them; passing a `Seat` to the auto-climate command is off-by-one (issue #11).
 - **Naming**: camelCase for class instance attributes that mirror API structure (`energySites`, `createFleet`). Snake_case for method names that are API endpoints.
+- **BLE discovery gotcha**: a Tesla vehicle advertises no 128-bit service UUID pre-connect — only its VIN-derived local name (`^S[a-f0-9]{16}[CDRP]$`), and only in the scan response, not the `ADV_IND`. `SERVICE_UUID` (`tesla_fleet_api/tesla/vehicle/bluetooth.py`) exists only as a GATT service after connecting. Never pass `service_uuids=[SERVICE_UUID]` as a `BleakScanner` discovery-time filter — it hides the vehicle on a direct BlueZ adapter (an ESPHome proxy doesn't enforce that filter the same way, which can mask the bug in testing). Scan unfiltered with active scanning and match by name; keep `SERVICE_UUID` for post-connect GATT use only.
+
+## Maintaining this file
+
+Keep this file for knowledge useful to almost every future agent session in this project.
+Do not repeat what the codebase already shows; point to the authoritative file or command instead.
+Prefer rewriting or pruning existing entries over appending new ones.
+When updating this file, preserve this bar for all agents and keep entries concise.
diff --git a/tesla_fleet_api/tesla/vehicle/bluetooth.py b/tesla_fleet_api/tesla/vehicle/bluetooth.py
index 0d259ad..78660e2 100644
--- a/tesla_fleet_api/tesla/vehicle/bluetooth.py
+++ b/tesla_fleet_api/tesla/vehicle/bluetooth.py
@@ -208,7 +208,10 @@ async def find_vehicle(
         """Find the Tesla BLE device."""
 
         if scanner is None:
-            scanner = BleakScanner(service_uuids=[SERVICE_UUID])
+            # No service_uuids filter: the vehicle advertises no service UUID
+            # (SERVICE_UUID is GATT-only, post-connect); active scan is needed
+            # since the name lives in the scan response, not the advertisement.
+            scanner = BleakScanner(scanning_mode="active")
 
         if address is not None:
             device = await scanner.find_device_by_address(address)
diff --git a/tests/test_find_vehicle_scan_filter.py b/tests/test_find_vehicle_scan_filter.py
new file mode 100644
index 0000000..88225e8
--- /dev/null
+++ b/tests/test_find_vehicle_scan_filter.py
@@ -0,0 +1,61 @@
+"""Regression test: find_vehicle must not scan-filter by service UUID.
+
+The vehicle advertises no 128-bit service UUID (SERVICE_UUID is GATT-only,
+available only after connecting); it only advertises its VIN-derived name in
+the scan response. A service_uuids scan filter hides the vehicle entirely on
+a direct BlueZ adapter.
+"""
+
+from unittest import IsolatedAsyncioTestCase
+from unittest.mock import AsyncMock, MagicMock, patch
+
+from cryptography.hazmat.primitives.asymmetric import ec
+
+from tesla_fleet_api.tesla.vehicle.bluetooth import VehicleBluetooth
+
+
+class _ConcreteVehicleBluetooth(VehicleBluetooth):
+    async def _send(self, msg, requires):  # pragma: no cover - not reached
+        raise AssertionError("_send should not be called in this test")
+
+
+class FindVehicleScanFilterTests(IsolatedAsyncioTestCase):
+    VIN = "5YJXCAE43LF123456"
+
+    def _make_vehicle(self) -> _ConcreteVehicleBluetooth:
+        parent = MagicMock()
+        key = ec.generate_private_key(ec.SECP256R1())
+        return _ConcreteVehicleBluetooth(parent, self.VIN, key)
+
+    async def test_default_scanner_has_no_service_uuid_filter(self):
+        vehicle = self._make_vehicle()
+
+        fake_device = MagicMock()
+        captured_kwargs = {}
+
+        class FakeScanner:
+            def __init__(self, *args, **kwargs):
+                captured_kwargs.update(kwargs)
+
+            async def find_device_by_name(self, name):
+                return fake_device
+
+        with patch("tesla_fleet_api.tesla.vehicle.bluetooth.BleakScanner", FakeScanner):
+            device = await vehicle.find_vehicle()
+
+        self.assertIs(device, fake_device)
+        self.assertNotIn("service_uuids", captured_kwargs)
+        self.assertEqual(captured_kwargs.get("scanning_mode"), "active")
+
+    async def test_matches_by_vin_derived_name_without_service_uuid(self):
+        vehicle = self._make_vehicle()
+
+        fake_device = MagicMock()
+        find_device_by_name = AsyncMock(return_value=fake_device)
+        scanner = MagicMock()
+        scanner.find_device_by_name = find_device_by_name
+
+        device = await vehicle.find_vehicle(scanner=scanner)
+
+        find_device_by_name.assert_awaited_once_with(vehicle.ble_name)
+        self.assertIs(device, fake_device)