p1801 and p1806 codes come up on 2000 Hyundai accent?

P1801:------- Immobilizer Transponder Error. ------------------------------ P1805/P1806:----- EEPROM Error/VIN Mismatch. ------------- In most cases the error 1801 and 1805 comes up together.But error 1806 is very rare.But 1806 and 1805 both are error related to same problem. P1801 and P1805/06 are immobilizer errors. Does your car have an anti-theft
device which reads a transponder in the key? If so, the problem is with
this system. The immobilizer problems are typically with thelock cylinder sensor.

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