What is the reason for the persistent illumination of the Focus engine malfunction indicator light?

[Kimberly]

The reason for the persistent illumination of the Focus engine malfunction indicator light is a fault in the fuel emission system. When the malfunction light is on, start and turn off the vehicle three times, then start the vehicle again to observe whether the malfunction light remains illuminated. If it is still on, it is necessary to promptly visit a service center to check the fault code to determine whether the issue lies with the engine or the sensor. The Focus is a 4-door, 5-seat compact sedan under Changan Ford, with exterior dimensions of 4647mm in length, 1810mm in width, and 1468mm in height, a wheelbase of 2705mm, and a trunk capacity of 511 liters. The vehicle is equipped with a 1.5-liter naturally aspirated engine, delivering a maximum power of 90 kilowatts and a maximum torque of 153 Newton-meters.