The Volvo Part Number 1397381 is an Engine Camshaft Plug. It is designed to seal the camshaft bore in the engine valve cover. Here are some key details about this part: Purpose: Prevents oil leaks from the engine. Material: Typically made of plastic or rubber. Fitment: This part is compatible with various Volvo models, including the S40, S60, V70, XC60, and others. Replacement: If you notice oil leaks around the camshaft area, this plug might be damaged and need replacement.