The Wrench's Steering Wheel tells the story of Chen Xiangyuan, an automotive repair technician in a small town. Relying on his outstanding technical skills and professional integrity, he clears his name through standardized procedures and a complete chain of evidence despite repeated harassment and fabricated accusations by deputy factory director Ma Baocheng. After being promoted to deputy factory director, he introduces a digital work-order assignment system, dedicates himself to technical training and mentoring apprentices, and safeguards road safety through craftsmanship, ensuring that his skills and trade are passed down to the next generation.