An important aspect raised in the article is the practical application of rules dedicated to Poka-Yoke systems using real industrial automation components that enable detection of defective elements. The article includes also an optimization of the structure of constructed devices for an unambiguous determination of the Poka-Yoke criteria and a minimization of the possibility of random errors made by the employee (or intentionally deceives of sensor systems). Despite clear conditions of the method the authors observed a lack of publications related to the description of the implementation of equipment elaborated in accordance with the presented methodology in industrial applications. This article presents the author's Poka-Yoke system used for a detection of drawpieces made of steel (with welded nuts) which are components of systems of passenger cars.