diff --git a/homeassistant/components/sensor/__init__.py b/homeassistant/components/sensor/__init__.py
index 9ebf225c637..f7fbecea224 100644
--- a/homeassistant/components/sensor/__init__.py
+++ b/homeassistant/components/sensor/__init__.py
@@ -418,12 +418,8 @@ class SensorEntity(Entity):
         None  # Subclasses of SensorEntity should not set this
     )
     _last_reset_reported = False
-    _temperature_conversion_reported = False
     _sensor_option_unit_of_measurement: str | None = None
 
-    # Temporary private attribute to track if deprecation has been logged.
-    __datetime_as_string_deprecation_logged = False
-
     async def async_internal_added_to_hass(self) -> None:
         """Call when the sensor entity is added to hass."""
         await super().async_internal_added_to_hass()