* 2.0L Zetec (130 hp): This was the standard engine for most trims.
* 2.0L Duratec (130 hp): This engine was available in some trims, specifically those marketed as "SE" and "ZX3."
* 2.3L Duratec (155 hp): This engine was available in the "ZX5" trim.
To be absolutely sure which engine your specific 2003 Ford Focus has, you can:
* Check the VIN: The Vehicle Identification Number (VIN) contains information about your car's engine. You can usually find it on the driver's side dashboard or on the driver's side doorjamb.
* Look at the engine compartment: The engine's displacement is often stamped on a tag near the engine itself.
* Consult your owner's manual: This will also tell you the specific engine your vehicle came equipped with.