SONATA 2000, 2.4 dohc, engine check light is on..

my engine check light went on so i check it with OBD2 and P0171 came out. if anyone knows anything about this error message, please leave a comment

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P0171 System too Lean - Bank 1.
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Check for vacuum or intake leaks, especially around the PCV hose and the intake bellows. If you have none, the problem is likely with your air flow sensor.
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