diff --git a/tests/components/co2signal/snapshots/test_diagnostics.ambr b/tests/components/co2signal/snapshots/test_diagnostics.ambr
new file mode 100644
index 00000000000..ffb35edfbbb
--- /dev/null
+++ b/tests/components/co2signal/snapshots/test_diagnostics.ambr
@@ -0,0 +1,33 @@
+# serializer version: 1
+# name: test_entry_diagnostics
+  dict({
+    'config_entry': dict({
+      'data': dict({
+        'api_key': '**REDACTED**',
+        'location': '',
+      }),
+      'disabled_by': None,
+      'domain': 'co2signal',
+      'entry_id': '904a74160aa6f335526706bee85dfb83',
+      'options': dict({
+      }),
+      'pref_disable_new_entities': False,
+      'pref_disable_polling': False,
+      'source': 'user',
+      'title': 'Mock Title',
+      'unique_id': None,
+      'version': 1,
+    }),
+    'data': dict({
+      'countryCode': 'FR',
+      'data': dict({
+        'carbonIntensity': 45.98623190095805,
+        'fossilFuelPercentage': 5.461182741937103,
+      }),
+      'status': 'ok',
+      'units': dict({
+        'carbonIntensity': 'gCO2eq/kWh',
+      }),
+    }),
+  })
+# ---
diff --git a/tests/components/co2signal/test_diagnostics.py b/tests/components/co2signal/test_diagnostics.py
index c73409fa59b..ed73cb960b5 100644
--- a/tests/components/co2signal/test_diagnostics.py
+++ b/tests/components/co2signal/test_diagnostics.py
@@ -1,8 +1,9 @@
 """Test the CO2Signal diagnostics."""
 from unittest.mock import patch
 
+from syrupy import SnapshotAssertion
+
 from homeassistant.components.co2signal import DOMAIN
-from homeassistant.components.diagnostics import REDACTED
 from homeassistant.const import CONF_API_KEY
 from homeassistant.core import HomeAssistant
 from homeassistant.setup import async_setup_component
@@ -15,11 +16,15 @@ from tests.typing import ClientSessionGenerator
 
 
 async def test_entry_diagnostics(
-    hass: HomeAssistant, hass_client: ClientSessionGenerator
+    hass: HomeAssistant,
+    hass_client: ClientSessionGenerator,
+    snapshot: SnapshotAssertion,
 ) -> None:
     """Test config entry diagnostics."""
     config_entry = MockConfigEntry(
-        domain=DOMAIN, data={CONF_API_KEY: "api_key", "location": ""}
+        domain=DOMAIN,
+        data={CONF_API_KEY: "api_key", "location": ""},
+        entry_id="904a74160aa6f335526706bee85dfb83",
     )
     config_entry.add_to_hass(hass)
     with patch("CO2Signal.get_latest", return_value=VALID_PAYLOAD):
@@ -27,10 +32,4 @@ async def test_entry_diagnostics(
 
     result = await get_diagnostics_for_config_entry(hass, hass_client, config_entry)
 
-    config_entry_dict = config_entry.as_dict()
-    config_entry_dict["data"][CONF_API_KEY] = REDACTED
-
-    assert result == {
-        "config_entry": config_entry_dict,
-        "data": VALID_PAYLOAD,
-    }
+    assert result == snapshot