The wireless sensor network consists of wireless devices for monitoring environment and physical conditions of diesel engines. The main advantage of wireless network is a flexible network and can easily adapt changes. The main parameters that are considered in Wireless sensor technology is temperature, pressure, speed, and the pollution level. Wireless sensors technology helps diesel engine to enhance fuel consumption in injection system by controlling of all fuel injector in engine to optimised level depending upon the speed and acceleration of the vehicle. These wireless technologies can also use for controlling harmful gas that exist from exhaust to atmosphere. The main application of wireless sensor technology application is air pollution monitoring which is exhaust gas.