Ford Focus engine failure with check engine light illuminated under 100,000 miles on Ford Focus

Some Ford Focus owners report experiencing engine failure with the check engine light illuminated under 100,000 miles, often due to several common issues. These include misfires caused by worn-out or faulty spark plugs, which can significantly affect engine performance. Additionally, problems with the Mass Airflow Sensor may contribute to similar performance issues and trigger the check engine light. In more severe cases, a damaged EGR valve can lead to engine hesitation, stumbling, or loss of power, with diagnostic trouble codes stored in the PCM. Some owners also note that while resetting the check engine light may provide a temporary fix, it is essential to address the underlying issue to prevent recurring problems. It is advisable for owners experiencing these symptoms to diagnose and resolve the potential causes effectively.