The below table reflects the 30 valid Year values along with prohibited characters. All other keyboard characters are prohibted as well. Some value can represent two different years for 1981 VINs to present.
If the VIN Decoding returns an unexpected Year, enter a value in the Year box. When there is a Year input, it will be checked against valid values and against the VIN decoded Year. If a Year cannot be validated then the VIN decoder Year will be used.