Hyundai Repair: OBD II autoscanner., obd ii, hyundai accent

Question
My hyundai accent  (2003) car has check engine light on.
So, Ichecked this car with OBD II autoScanner.
the result is PO401.
Waht does it mean?
what should I repair and replace?
please tell me.
in advance thank  you for your answer.  

Answer
P0401 indicates a problem with the EGR system.  Since your vehicle doesn't have an EGR system, I suspect you either copied the code incorrectly or your scanner isn't communicating properly.

I'd recommend rechecking with your scanner to be sure that the code displayed is actually P0401.  If it is, you should try another type scanner or code reader.