Toshico had her car repaired by a mechanic because there was a problem or damage with her car that needed to be fixed. Mechanics are trained professionals who specialize in diagnosing and fixing issues with vehicles. Toshico likely took her car to a mechanic because she either didn't have the knowledge or tools to fix the problem herself, or she wanted to ensure that the repair was done correctly and safely. By taking her car to a mechanic, Toshico can trust that the necessary repairs were made to restore her car's functionality and ensure its continued safe operation on the road.