Diagnostic code P1159 on a 2004 Hyundai Santa Fe typically indicates a problem with the fuel system, specifically related to the fuel trim or air-fuel mixture. This code may suggest an issue with the oxygen sensors, mass airflow sensor, or fuel injectors, which can lead to poor engine performance and increased emissions. It's advisable to have a qualified mechanic perform further diagnostics to pinpoint the exact cause and address the issue effectively.
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