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If your Ford Focus is showing an engine code 7E8, it likely indicates a problem with the fuel/air intake system. This could also be accompanied by code P1326, which pertains to the Engine Fuel and Air Metering Throttle/Pedal Position Sensor. While it's recommended to check the sensor first, the code may actually be triggered by a faulty knock sensor. Signs of a malfunctioning knock sensor include engine knock and pinging sounds, as well as poor acceleration when pressing the pedal. You can find a compatible replacement part at AutoZone for around $23, and installing it should clear the trouble codes if this is the issue.
Code 7E8 detected on a Ford Focus indicates an issue with the intake system.