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In 2009, Honda plans to introduce passenger vehicles simultaneously in Japan and the United States that employ advanced engines diesel technology designed to meet U.S. Tier 2 Bin 5 emissions in all 50 states. Initially, a Honda Accord Diesel will be offered, with the risk of being the second recipient of the Honda CR-V engine. Future plans for a diesel version of the Maxima, a business partnership with Renault. The stand-out feature of the technology is that the Honda engine, unlike competitive products do not require the addition of urea to operate.

Honda Accord first announced diesel Tokyo Motor Show in 2007. The vehicle has an aluminum 2.2-liter 150 horsepower with 260 lb.-ft. of torque. Unlike similar diesel made by companies like Mercedes and Volkswagen, Honda engines will not require fluid replacement AdBlue urea to operate the control system and the actual emissions. The new engines have a NOx converter by a chemical reaction that produces its own while generating no more ammonia harmless nitrogen and water.

The NOx converter consists of two layers of substrate in the honeycomb matrix. The outer layer functions to store NOx emissions, while the second, the bottom layer, consisting of platinum particles, reacts primarily with the exhaust gases. This reaction, in rich combustion is ammonia. Ammonia, in turn, reacts with the NOx stored and the results of nitrogen and water products. According to statements by Honda, this technology has developed the internal capacity and scalable allowing you to be used in a variety of vehicle configurations.

Since 2006, the ultra-low sulfur (ULSD) has been the norm in Europe and North America, with aggressive new emissions standards on top of the U.S. from model year 2007. The use of this cleaner fuel alternative diesel led to the development of innovative technologies for emission control, in turn revived the genre of diesel, once considered the exclusive domain of smelly, dirty trucks, heavy. Diesel vehicles have much higher levels of nitrogen oxides in exhaust gases, until recently, was wary automakers to explore the products as a way to meet higher standards improved fuel economy mandated by Congress .

The balance between the standards of cleanliness by the rules of the economy was, in the opinion of most automakers, too complicated and too expensive. Rapid advances in technology programs, however, change the outcome of this equation. This new technology without urea Honda clearly pushes the envelope in controlling diesel emissions and serves to develop further the development of a whole spate of new diesel start appearing in showrooms in late 2008 and 2009 a variety of manufacturers.