Wireless sensor networks are used to monitor physical and environmental conditions. User authentication is required to achieve a consistent access control. However, authenticating a user or sensor in a network is a challenging task owing to the limited resources of the sensor nodes. Therefore, to provide secure and efficient communication, numerous authentication schemes have been designed. Traditional schemes have several security vulnerabilities and significant computational overhead. In this paper, we propose an Enhanced biometric based user Authentication Scheme using Fuzzy extraction and Elliptic curve cryptography (EBAS-FeEcc) for wireless sensor networks to achieve high security level and improve the performance as well as life time of entire network. Presented technique consists of easy operations and light computations. Analysis shows that previous schemes have various security weaknesses such as a biometric recognition error, user verification problem, lack of anonymity, session key exposure by the gateway node, and perfect forward secrecy. Our proposed technique overcomes these network security issues. Our scheme additionally increases performance of the network by reducing network traffic, defending sensor network against DOS attack and increasing nodes battery life. Therefore, the functionality and performance of the entire network improves.