Here are Ford Focus engine problems, by model year. The most common Focus engine problems cost $2,200 to fix & occur at 112,000 miles. Regarding the worst model year 2002 Ford Focus engine problems, "The 2002 Ford Focus 2.0L SOHC engine has a defect where the intake valve seat fails. The valve then falls into the cylinder, destroying the engine & most owner relationships with Ford in the process" Click on a year below.

Worst Engine Problems
engine failure 2002 Ford Focus
engine failure 2001 Ford Focus
blown engine 2000 Ford Focus