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P1412 on a Kia means the engine computer has detected a low signal voltage from the EGR differential pressure sensor, which measures the pressure drop across the exhaust gas recirculation (EGR) valve to confirm actual flow. The computer expects the sensor to report a voltage within a calibrated range, and a sustained low reading tells it the sensor circuit is grounded, shorted, or the sensor itself has failed.
Guidance is general and written for Kia vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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