Yes, you must pass a test for each repair category in which you want to be certified. The law does not provide a "grandfather clause." The only way to qualify for state certification is to pass the state exam or if you have passed tests administered by the National Institute for Automotive Service Excellence (ASE), you may be eligible to apply for state certification in certain categories.  ASE certification alone does NOT qualify you as a state certified mechanic.

Telephone the Licensing Unit at 1-888-SOS-MICH (1-888-767-6424) for further information.

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