P PT. Toyoplas Manufacturing Indonesia is a manufacturing company engaged in plastic injection, producing various types of automotive parts, car audio, and mechanic electronics. The problem that occurs is that the defect level of the Car Audio Panel product is high and exceeds the company's tolerance limit, which is 3%. This study aims to improve the quality and reduce the level of disability of the Car Audio Panel using the Six Sigma method in the stages of Define, Measure, Analyze, Improve, Control. Obtained 7 Critical to Quality, namely Dirty, Broken, Gas Mark, Material Chip, Flashes, Scratch, and Flow Mark. There are 24489.8 possibilities that the production of Car Audio Panels results in failure every one million opportunities and the sigma level is 3.47 sigma, meaning that the Car Audio Panel production process is above the average sigma value of the industry in Indonesia. Obtained 80% of the most dominant defects are Dirty, Flow Mark, and Scratch. Created a fishbone diagram and a Failure Mode and Effect Analysis, the highest Risk Priority Number values ​​were obtained from the failure of Dirty, Flow Mark, and Scratch, namely 336, 280, and 252.Based on the Fault Tree Analysis, the highest probability value for failure is that the cleaning schedule is not executed accordingly the company's direction is 0.45, the operator is not running the Standard Operating Procedure correctly, namely 0.3, and there are no rules for product placement, namely 0.35. Proposals are given to improve daily cleaning of machines using forms as a control tool, provide training for operators every 3 months, and SOP for product laying. Implementation of the proposal was carried out for 6 days, obtained DPMO values ​​and sigma levels of 21768.71 and 3.52 sigma. So it can be concluded that there is a decrease in the DPMO value of 2721.09 and an increase in the sigma value of 0.05 sigma.