The engine number on a 2003 Ford Focus is typically located on the top of the engine block, near the front. However, it's often difficult to see without removing some components or using a mirror. It's a stamped number, not a sticker.
Because of its location and potential obstructions, it's best to consult your owner's manual for the precise location. The manual will have diagrams and may give alternative places to check. A picture in the manual would greatly aid in finding it.
