diff --git a/ingestion/src/metadata/ingestion/source/database/bigquery/metadata.py b/ingestion/src/metadata/ingestion/source/database/bigquery/metadata.py
index 2a5f055f071..eed889e84bd 100644
--- a/ingestion/src/metadata/ingestion/source/database/bigquery/metadata.py
+++ b/ingestion/src/metadata/ingestion/source/database/bigquery/metadata.py
@@ -197,10 +197,19 @@ class BigquerySource(StoredProcedureMixin, CommonDbSourceService):
     """
 
     def __init__(self, config, metadata):
+        # Check if the engine is established before setting project IDs
+        # This ensures that we don't try to set project IDs when there is no engine
+        # as per service connection config, which would result in an error.
+        self.test_connection = lambda: None
         super().__init__(config, metadata)
         self.temp_credentials = None
         self.client = None
+        # Upon invoking the set_project_id method, we retrieve a comprehensive
+        # list of all project IDs. Subsequently, after the invokation,
+        # we proceed to test the connections for each of these project IDs
         self.project_ids = self.set_project_id()
+        self.test_connection = self._test_connection
+        self.test_connection()
 
     @classmethod
     def create(cls, config_dict, metadata: OpenMetadata):
@@ -217,11 +226,15 @@ class BigquerySource(StoredProcedureMixin, CommonDbSourceService):
         _, project_ids = auth.default()
         return project_ids if isinstance(project_ids, list) else [project_ids]
 
-    def test_connection(self) -> None:
-        for project_id in self.set_project_id():
-            self.set_inspector(project_id)
+    def _test_connection(self) -> None:
+        for project_id in self.project_ids:
+            inspector_details = get_inspector_details(
+                database_name=project_id, service_connection=self.service_connection
+            )
             test_connection_fn = get_test_connection_fn(self.service_connection)
-            test_connection_fn(self.metadata, self.engine, self.service_connection)
+            test_connection_fn(
+                self.metadata, inspector_details.engine, self.service_connection
+            )
 
     def query_table_names_and_types(
         self, schema_name: str
diff --git a/ingestion/tests/unit/test_handle_partitions.py b/ingestion/tests/unit/test_handle_partitions.py
index c0ff3afa363..038454c2d92 100644
--- a/ingestion/tests/unit/test_handle_partitions.py
+++ b/ingestion/tests/unit/test_handle_partitions.py
@@ -97,17 +97,20 @@ class BigqueryUnitTest(TestCase):
         "metadata.ingestion.source.database.bigquery.metadata.BigquerySource.set_project_id"
     )
     @patch(
-        "metadata.ingestion.source.database.bigquery.metadata.BigquerySource.test_connection"
+        "metadata.ingestion.source.database.bigquery.metadata.BigquerySource._test_connection"
     )
+    @patch("metadata.ingestion.source.database.common_db_source.get_connection")
     def __init__(
         self,
         methodName,
+        get_connection_common,
         test_connection,
         set_project_id,
         create_generic_connection,
         client,
     ) -> None:
         super().__init__(methodName)
+        get_connection_common.return_value = Mock()
         client.return_value = Mock()
         create_generic_connection.return_value = Mock()
         set_project_id.return_value = Mock()
diff --git a/ingestion/tests/unit/topology/database/test_bigquery.py b/ingestion/tests/unit/topology/database/test_bigquery.py
index f89358a84c1..089b40adbb6 100644
--- a/ingestion/tests/unit/topology/database/test_bigquery.py
+++ b/ingestion/tests/unit/topology/database/test_bigquery.py
@@ -53,7 +53,7 @@ EXPECTED_URL = "https://console.cloud.google.com/bigquery?project=random-project
 
 class BigqueryUnitTest(TestCase):
     @patch(
-        "metadata.ingestion.source.database.bigquery.metadata.BigquerySource.test_connection"
+        "metadata.ingestion.source.database.bigquery.metadata.BigquerySource._test_connection"
     )
     @patch(
         "metadata.ingestion.source.database.bigquery.metadata.BigquerySource.set_project_id"