Nowadays, the role of customer satisfaction in maintaining and developing market share is a key point in any organization success. Therefore, this research through applying SERVQUAL approach, attempts to identify strength and weak points of after-sales service of Iran Khodro. For this reason, a measure is first developed to measure Iran Khodro’s after sales service through SERVQUAL approach. The research data was gathered by distributing 230 questionnaires among those who have SAMAND auto in Yazd province. Through an exploratory factor analysis, nine factors such as: reliability, faire, trust and justice, honesty, access, to inform, competence and morals, possibilities, and adornment were identified. Also, the validity of the research conceptual model was evaluated using confirmatory factor analysis. Then, it was attempted through drawing a map for quality elements, the critical success and failure factor of Iran Khodro’s after-sales service is identified. The results indicate the critical success factors are as follows: validity, access, reliability, faire (comfortable delivery process) and adornment (personnel). The critical failure factors are as follows: possibilities, honesty, trust and justice, adornment (a place for customer relaxing), faire (respect to customer time) and to inform (giving enough information on selling/delivering time).