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This paper presents a model for reliability prediction of motor vehicle components in field use based on guarantee data. The method is an extension of the reliability prediction model from Pauli [1], which was originally developed for the analysis of electronic control units. The model is applied for the first time to body electronic products. Therefore, a generalized failure model is developed. In a case study an electronic actuator is analysed considering a mixed failure model and then compared to a simple failure model approach. The prediction model derives km- and time-dependent reliability characteristics and is proven to be a powerful tool.