Maintenance is one of the systems which can play an essential role in the success of manufacturing and services systems. One of the most maintenance innovative approaches is agile maintenance. Based on this approach, organizations integrate maintenance concepts with agility features such as: flexibility, agile and fast move, etc and also are trying to provide one hundred percent preparing equipment. This research aims to consider the literature related to agile maintenance and to provide key and effective factors of agile maintenance in vehicle industry in Iran using a fuzzy Delphi method. This research applies fuzzy DEMATEL method for providing a ranking and relationships between criterion. The results showed that the key and effective factors are as bellow: the quick decisions, the coordination, the capability and infrastructure of IT, the sharing information actively with partners, the quantity and quality of services, the utilization of the appropriate technology, the accurate planning of activities, the planning demand supply, the control maintenance, the top manager commitment, the participatory management style, the virtual organization. The quick decisions and the sharing information actively with partners are the most effective and the most impressible factors as well.