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The "check engine" light in a Ford Fusion comes on to signal that the car's internal diagnostics have detected issues such as an exhaust leak, misfire, or engine timing problem that need attention. This warning is designed to either flash if it's a serious problem or stay steadily lit for less urgent issues. A flashing light is often linked to excess fuel entering the exhaust system, which can lead to overheating and catalytic converter issues. Sometimes, a faulty spark plug may cause the light to flash, which isn't life-threatening but still requires prompt servicing. Other culprits like a failing O2 sensor, weak battery, or alternator can also trigger the "check engine" indicator. Taking the car to a reputable mechanic who can use an OBDII scanner to diagnose the problem is recommended.
When the check engine light is illuminated, the engine might release dangerous emissions from the exhaust. In severe situations, key components like the catalytic converter or oxygen sensor could be impacted. If the check engine light is flashing, it indicates an engine misfire, regardless of any performance issues. It's crucial to immediately pull over and not continue driving to prevent damage to the catalytic converter, which could result in repair costs exceeding $1000.