And while the mechanic or garage owner can place a lien on your car, they can not sell your car to pay your debt.
570.305 Garage keeper's lien; enforcement; sale of vehicle at public sale.
Sec. 5. (1) A lien under section 3 shall be enforced only as provided in this section.
(2) If charges described in section 3 are not paid,
the garage keeper may sell the vehicle at a public saledescribed in this section
https://www.legislature.mi.gov/(S(uddgwv552ot3ew453natxq55))/documents/mcl/pdf/mcl-Act-312-of-1915.pdfThe basic principle of lien is that you recover your losses. If you can't sell the assest you hold/sieze then there is no point to lien.