There are a total of four odometer codes, which indicate the reliability of the odometer reading. Listed below are the codes and what they represent:
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ACTUAL – The odometer reading is considered to be true and actual.
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NOT ACTUAL – The odometer reading is not accurate or cannot be determined.
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EXEMPT – The odometer reading is not required by federal law.
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EXCEEDS MECHANICAL LIMITS – The actual odometer reading has reached the highest numbers mechanically available (it has "rolled over"), and it cannot be determined.