Is the second-hand car shop in the facade shop of residential building allowed to repair and maintain vehicles? Is it legal?

Generally speaking, it is unreasonable. Automobile maintenance is a pre-approval project, and it needs a special repair qualification certificate issued by the Transportation Bureau to apply for a business license in the Industrial and Commercial Bureau. If there is no automobile maintenance project in the business scope, you need to apply for the above qualifications to be qualified to operate this project normally.