Section 250-173-5 - REQUIREMENTS AND METHODS FOR MARKING CATALYTIC CONVERTERS FOR LICENSED NEW AND USED CAR DEALERSA.Requirements: Except for when a motor vehicle is sold at wholesale or when a catalytic converter is not in a location that is clearly visible from the underside of the motor vehicle, licensed New and Used Car Dealers who are selling vehicles through retail sale shall legibly mark all catalytic converters that are visible and accessible for all vehicles in their inventory. No disassembly is required to gain access to or mark a catalytic converter.B.Marking Standard: The marking shall consist of the complete and legible VIN in a single line. If there is not adequate space to mark on one line, the VIN may be marked in multiple lines in the correct number sequence.C.Marking Errors: A straight line shall be drawn through the entire VIN when an error is made in marking. The correct VIN shall be marked directly below; if there is not adequate space, the correct vin shall be marked in the general area.D.Method: The marking shall be made by engraving only. There is no set standard on the type of tool used to engrave the catalytic converter; however, the chosen tool must be sufficient to permanently mark the catalytic converter.E.Materials: Both standard catalytic converters and diesel particulate filters shall be marked.29-250 C.M.R. ch. 173, § 5