PT. XYZ is a company located on Jalan Bungur Besar, West Jakarta which has a factory in the Tangerang area that produces oil pumps that have been operating since 1986. In the production process, PT. XYZ, one of the losses experienced by the company is a decrease in quality to produce a product. Then, the decline in product quality includes defects in the product caused by several factors that require quality control in production. Quality control of petroleum pump products carried out at PT. XYZ is divided into several parts. The methods used in analyzing and solving porduct defect problems at PT. XYZ use Pareto diagrams, proportion control charts, fishbone diagrams, and the House of Quality method. By analyzing and solving product defect problems, defect reduction can be made by identifying, analyzing, and providing suggestions for improvement so that quality and quality standards are maintained so that product quality is maintained.PT. XYZ is a company located on Jalan Bungur Besar, West Jakarta which has a factory in the Tangerang area that produces oil pumps that have been operating since 1986. In the production process, PT. XYZ, one of the losses experienced by the company is a decrease in quality to produce a product. Then, the decline in product quality includes defects in the product caused by several factors that require quality control in production. Quality control of petroleum pump products carried out at PT. XYZ is divided into several parts. The methods used in analyzing and solving porduct defect problems at PT. XYZ use Pareto diagrams, proportion control charts, fishbone diagrams, and the House of Quality method. By analyzing and solving product defect problems, defect reduction can be made by identifying, analyzing, and providing suggestions for improvement so that quality and quality standards are maintained so that product quality is maintained.