diff --git a/workspaces/lightspeed/.changeset/fix-byok-vector-store-ids.md b/workspaces/lightspeed/.changeset/fix-byok-vector-store-ids.md
new file mode 100644
index 0000000000..21e14b84e9
--- /dev/null
+++ b/workspaces/lightspeed/.changeset/fix-byok-vector-store-ids.md
@@ -0,0 +1,5 @@
+---
+'@red-hat-developer-hub/backstage-plugin-lightspeed-backend': patch
+---
+
+Removed hardcoded vector_store_ids override to enable BYOK RAG sources
diff --git a/workspaces/lightspeed/plugins/lightspeed-backend/src/service/router.ts b/workspaces/lightspeed/plugins/lightspeed-backend/src/service/router.ts
index cfed3b1112..d3f2d29066 100644
--- a/workspaces/lightspeed/plugins/lightspeed-backend/src/service/router.ts
+++ b/workspaces/lightspeed/plugins/lightspeed-backend/src/service/router.ts
@@ -134,8 +134,6 @@ export async function createRouter(
     lightspeedCoreBaseUrl,
     logger,
   );
-  let lightspeed_vector_store_id: string = '';
-
   // Parse admin-configured MCP servers from app-config.
   // Only name is required; token is optional (users can provide their own via the UI).
   // URLs come from LCS (GET /v1/mcp-servers), not from app-config.
@@ -601,19 +599,6 @@ export async function createRouter(
 
         logger.info(`/v1/query receives call from user: ${userEntityRef}`);
 
-        // get the vector store id for the rhdh-product-docs vector store
-        if (lightspeed_vector_store_id === '') {
-          const vectorStores = await vectorStoresOperator.vectorStores.list();
-          lightspeed_vector_store_id =
-            vectorStores.data.find((v: any) =>
-              v.name.startsWith('rhdh-product-docs'),
-            )?.id || '';
-        }
-
-        if (lightspeed_vector_store_id !== '') {
-          request.body.vector_store_ids = [lightspeed_vector_store_id];
-        }
-
         const userQueryParam = `user_id=${encodeURIComponent(userEntityRef)}`;
         request.body.media_type = 'application/json'; // set media_type to receive start and end event
         // if system_prompt is defined in lightspeed config