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What does it mean if the engine light on 2003 ford focus comes on?
Wiki User
∙ 11y ago
The check engine light is on because the ECU (computer) has detected a problem with the emissions system. Have the ECU scanned with an OBD2 scanner to retrieve the code that has been set. This code will help you determine what the problem is.
Wiki User
∙ 11y ago
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