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Code P1166 on a Kia Optima typically indicates a problem with the fuel level sensor or the fuel gauge system. This code suggests that the engine control module (ECM) has detected an issue with the signal from the fuel level sensor, which may result in inaccurate fuel readings. It's advisable to check the wiring, connectors, and the sensor itself for faults to resolve the issue. If necessary, a professional diagnostic can help pinpoint the exact cause.

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4mo ago

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