diff --git a/homeassistant/components/gatus/quality_scale.yaml b/homeassistant/components/gatus/quality_scale.yaml
index a5dadd68ea64..deb415ac2bac 100644
--- a/homeassistant/components/gatus/quality_scale.yaml
+++ b/homeassistant/components/gatus/quality_scale.yaml
@@ -64,9 +64,7 @@ rules:
   dynamic-devices: done
   entity-category: done
   entity-device-class: done
-  entity-disabled-by-default:
-    status: exempt
-    comment: All entities represent monitored services and should be enabled by default.
+  entity-disabled-by-default: done
   entity-translations: done
   exception-translations: done
   icon-translations: done
diff --git a/homeassistant/components/gatus/sensor.py b/homeassistant/components/gatus/sensor.py
index a04022ce8081..21682fce57e5 100644
--- a/homeassistant/components/gatus/sensor.py
+++ b/homeassistant/components/gatus/sensor.py
@@ -60,6 +60,7 @@ SENSOR_TYPES: tuple[GatusSensorEntityDescription, ...] = (
         key="status_code",
         translation_key="status_code",
         entity_category=EntityCategory.DIAGNOSTIC,
+        entity_registry_enabled_default=False,
         value_fn=lambda coordinator, endpoint: (
             endpoint.results[-1].status if endpoint.results else None
         ),
@@ -70,6 +71,7 @@ SENSOR_TYPES: tuple[GatusSensorEntityDescription, ...] = (
         device_class=SensorDeviceClass.ENUM,
         options=["start", "healthy", "unhealthy", "resolved"],
         entity_category=EntityCategory.DIAGNOSTIC,
+        entity_registry_enabled_default=False,
         value_fn=lambda coordinator, endpoint: (
             endpoint.events[-1].type.lower() if endpoint.events else None
         ),
@@ -79,6 +81,7 @@ SENSOR_TYPES: tuple[GatusSensorEntityDescription, ...] = (
         translation_key="certificate_expiration",
         device_class=SensorDeviceClass.TIMESTAMP,
         entity_category=EntityCategory.DIAGNOSTIC,
+        entity_registry_enabled_default=False,
         value_fn=lambda coordinator, endpoint: (
             coordinator.last_update_time
             + timedelta(
@@ -93,6 +96,7 @@ SENSOR_TYPES: tuple[GatusSensorEntityDescription, ...] = (
         key="dns_rcode",
         translation_key="dns_rcode",
         entity_category=EntityCategory.DIAGNOSTIC,
+        entity_registry_enabled_default=False,
         value_fn=lambda coordinator, endpoint: (
             DNS_RCODE_MAP.get(
                 endpoint.results[-1].dns_rcode,
diff --git a/tests/components/gatus/test_sensor.py b/tests/components/gatus/test_sensor.py
index 0facd887b425..9793a57c02f8 100644
--- a/tests/components/gatus/test_sensor.py
+++ b/tests/components/gatus/test_sensor.py
@@ -5,6 +5,7 @@ from unittest.mock import AsyncMock, patch
 
 from freezegun.api import FrozenDateTimeFactory
 from gatus_api import EndpointStatus, Result
+import pytest
 from syrupy.assertion import SnapshotAssertion
 
 from homeassistant.const import STATE_UNAVAILABLE, STATE_UNKNOWN, Platform
@@ -21,6 +22,7 @@ from tests.common import (
 )
 
 
+@pytest.mark.usefixtures("entity_registry_enabled_by_default")
 async def test_sensor_setup_and_states(
     hass: HomeAssistant,
     mock_gatus_client: AsyncMock,
@@ -153,6 +155,7 @@ async def test_sensor_missing_status_code(
     hass: HomeAssistant,
     mock_gatus_client: AsyncMock,
     mock_config_entry: MockConfigEntry,
+    entity_registry: er.EntityRegistry,
 ) -> None:
     """Test that a result missing status code evaluates to STATE_UNKNOWN for status code sensor."""
     mock_gatus_client.get_endpoints_statuses.return_value = [
@@ -165,6 +168,11 @@ async def test_sensor_missing_status_code(
     ]
 
     await setup_integration(hass, mock_config_entry)
+    entity_registry.async_update_entity(
+        "sensor.backend_service_status_code", disabled_by=None
+    )
+    await hass.config_entries.async_reload(mock_config_entry.entry_id)
+    await hass.async_block_till_done()
 
     state = hass.states.get("sensor.backend_service_status_code")
     assert state is not None
@@ -225,3 +233,25 @@ async def test_sensor_missing_dns_rcode(
 
     state = hass.states.get("sensor.backend_service_dns_response_code")
     assert state is None
+
+
+async def test_diagnostic_sensors_disabled_by_default(
+    hass: HomeAssistant,
+    mock_gatus_client: AsyncMock,
+    mock_config_entry: MockConfigEntry,
+    entity_registry: er.EntityRegistry,
+) -> None:
+    """Test that diagnostic sensors are disabled by default."""
+    await setup_integration(hass, mock_config_entry)
+
+    for sensor_key in (
+        "status_code",
+        "last_event",
+        "certificate_expiration",
+        "dns_response_code",
+    ):
+        entity_id = f"sensor.core_backend_service_{sensor_key}"
+        assert hass.states.get(entity_id) is None
+        entry = entity_registry.async_get(entity_id)
+        assert entry is not None
+        assert entry.disabled_by is er.RegistryEntryDisabler.INTEGRATION