Justin Diament is a lifelong automotive technician and entrepreneur with over two decades of hands-on experience diagnosing, repairing, and reselling everything from high-performance engines to modern EVs. As the owner of HK Engines LLC in Calabasas, California, Justin specializes in rebuilding OEM and performance engines and solving complex vehicle issues that others often miss. His technical depth spans Teslas, BMWs, Hyundais, and more—supported by advanced tools like Autel and Tesla Toolbox.

Before founding HK Engines, Justin managed Alternative Automotive Solutions, a successful used car and collision repair business that handled high-end salvaged vehicles from purchase to full resale. Over the years, he has cultivated a reputation for transparency, precision, and diagnosing hard-to-find issues—from bad HV battery states in hybrid systems to hidden ABS failures that compromise EV safety features. His ability to troubleshoot under pressure, including during on-set repairs for film productions, sets him apart in both the shop and the field.

As a YOUCANIC contributor, Justin shares real-world case studies and diagnostics that save DIYers and professionals valuable time and money. His hybrid and EV experience—like solving a no-start Hyundai Ioniq or tracing drivetrain faults to worn clutches—brings insight that goes far beyond the typical scan tool readout. Whether you're wrenching in your garage or running a shop, Justin’s goal is to help you fix smarter and avoid costly missteps.