Maryland Code, TRANSPORTATION 23-302
(2) An owner of a vehicle registered under § 13-919 of this article that has been in operation for at least 18 years from the vehicle’s model year or first registration date, whichever is later, shall have the vehicle inspected, maintained, and repaired by a preventive maintenance technician at least every 12,500 miles or at least every 6 months, whichever occurs first.
(3) An owner of a vehicle registered under § 13-923 of this article that has been in operation for not more than 5 years from the vehicle’s model year shall have the vehicle inspected, maintained, and repaired by a preventive maintenance technician at least every 35,000 miles or at least every 12 months, whichever occurs first.
(4) An owner of a vehicle registered under § 13-916 or § 13-919 of this article that has been in operation for not more than 5 years from the vehicle’s model year shall have the vehicle inspected, maintained, and repaired by a preventive maintenance technician at least every 50,000 miles or at least every 12 months, whichever occurs first, if the vehicle is:
(i) A zero-emission electric vehicle; or
(ii) A fuel cell electric vehicle.
(b) A vehicle shall meet or exceed the standards and requirements set under the regulations adopted under this subtitle.
(c) A vehicle may not be operated unless at all times it is appropriately registered and the owner is in compliance with this section.