Here are the most common engine options for the 2005 Ford Focus:
* 2.0L 4-cylinder: This was the standard engine option for most trims, including the SE, SES, and ZX4.
* 2.3L 4-cylinder: This was available on the sporty SVT Focus.
* 2.0L Duratec I-4: This was offered as a gasoline engine option.
Please tell me which trim level or engine type you're interested in, and I can provide you with the exact engine size.