In today's business context, consumers are increasingly paying attention on protecting their rights. Therefore, managers of companies have to improve service quality so as to attract more and more customers. However, they generally do not know how to measure and improve it, this is partly because service quality is not as tangible as that of common commodities. The difficulty has been overcome and the SERVQUAL has become an effective indicator for measuring service quality for tertiary industry since it was proposed by Parasuraman, Zeithaml, Berry (1988). Many researchers measured the service quality for hotel, restaurant, hospital, bank by using SERVQUAL, but the empirical studies for measuring service quality of maintenance in automotive industry are quite few. To fill this gap, this study attempts to measure the service quality of maintenance after sale. We choose Lexus company's three service stations in Taichung as case and the respondents are sampled randomly. Based on our empirical results, some conclusions and strategies for improving service quality are proposed.