Motorcar Parts of America, Inc. engages in the manufacture, remanufacture, and distribution of automotive parts. It operates through the following segments: Hard Parts, Test Solutions and Diagnostic Equipment, and Heavy Duty. The Hard Parts segment is composed of light duty rotating electric products such as alternators and starters, wheel hub products, and brake-related products. The Test Solutions and Diagnostic Equipment segment represents bench top testers for alternators and starters, test solutions and diagnostic equipment for the pre- and post-production of electric vehicles, and software emulation of power systems applications for the electrification of all forms of transportation. The Heavy Duty segment deals with non-discretionary automotive aftermarket replacement hard parts for heavy-duty truck, industrial, marine, and agricultural applications. The company was founded by Mel Marks in 1968 and is headquartered in Torrance, CA.