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The computer turns that light on to tell you that a fault has been detected and the fault code has been stored. Use an automotive code scanner to determine what's wrong. If it's still running well, I'd suspect something like the oxygen sensor, throttle position sensor or any of a number of potential problems. The computer WILL tell you, you just need to know how to ask.
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What causes a Ford focus check engine light to turn on?
It comes on when the engine computer detects a malfunction and sets a code.
2004 focus check engine light on steady lease help?
There are pages and pages of causes. Have it checked for codes with a scan tool.
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The check engine light is a " picture " of an engine , just to the left of the engine temperature gauge
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The check engine light on a 2002 Ford Focus can be reset by disconnecting the battery for 1 to 2 minutes. This resets the vehicle's computer and clears the light.
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The engine is overheating. The check engine light is not on because you have no problem with the emissions system which this light monitors.
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Check your gas cap.....My check Engine light always comes on if it is loose or not on at all.
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Have vehicle scanned to determine the problem
Check engine light stays on what causes it?
The Check Engine Light (CEL) lights up when the Engine Control Module (ECM) detects a problem related to emissions or performance.
