ASSESSMENT OF THE RELIABILITY OF CARS DURING THE WARRANTY PERIOD

Abstract

In conclusion, the study conducted at the Kaunas auto center confirmed the importance of the warranty service provided by manufacturers in ensuring the quality and reliability of vehicles. Consumers are increasingly looking for inexpensive, high-quality, reliable cars with low repair costs. By analyzing the reliability ratings of different car models, consumers can make informed decisions when choosing a vehicle that meets their needs and preferences. The article presents a study of two car models of the same manufacturer, Škoda Octavia and Škoda Superb, focusing on defects during the warranty period. During the study, the dependence of engine, chassis, transmission, cooling system, electrical system defects on the mileage during the entire warranty period was evaluated. The failure probability of each system was analyzed to calculate the overall probability that the cars will not experience defects. A statistical mathematical model was developed and plotted on charts while collecting data on the distribution of defects. In the course of the investigation, the accumulated information on the recorded main system failures was used: engine, suspension, electronic systems. The study was carried out when the mileage was divided every 20,000 km, based on these data, variation lines were created, which were assigned to the failure of a certain system. Failures were fixed according to service during the warranty period. Collected data from 448 cars. It was found that the electronic system had the most defects during the warranty period, in percentage terms "Škoda Superb" 0.459 and "Škoda Octavia" 0.489, the least - in the engine and suspension systems, where the total probability of failure of "Škoda Octavia" reaches 0.300, and "Škoda Superb" 0.305 percent. . Research data show that after driving 50 thousand Kilometers of all system failures are increasing. It was noticed during the research, the increase in the probability of failure of both car models after driving 20,000 km. Km, but the difference in repair costs remains. Repair costs are lower for the mid-range Škoda Octavia model, and higher for the higher-class Škoda Superb model.