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Diesel Retrofits Continue To Slide

Posted on March 18, 2013

Sales of diesel retrofit devices have continued to fall, according to information released by the Manufacturers of Emission Controls Association (MECA), the national association of companies that manufacture a variety of emission control technologies for automobiles, trucks, buses, and off-road vehicles and equipment, as well as stationary internal combustion engines. 

The results of MECA’s annual survey show that  the total number of verified (U.S. EPA- and/or CARB-verified) diesel retrofit devices for both on-road and off-road diesel engines sold in the U.S. by MECA member companies was 16,262 in 2012. That’s down from 20,177 in 2011, 24,640 in 2010 and 29,180 in 2009, the association said. The decline in overall retrofit sales since 2009 is most likely due to the decrease in federal Diesel Emissions Reduction Act (DERA) funding for clean diesel projects over the same time period, as well as the recent trend of funding being spent more on projects that use engine repowers and/or vehicle replacements rather than retrofit devices, MECA said. 

Of the 2012 total, 68% (11,000) were diesel particulate filters (DPFs) and 28% (4501) were diesel oxidation catalysts (DOCs).  The total also includes 506 closed crankcase filters.  In California, 7825 diesel retrofit devices were sold, of which 90% (7034) were DPFs. 

In the U.S. (including California), 13,740 diesel retrofit devices were sold for on-highway diesel engines and 2522 for off-road diesels. Sales of DPFs in the U.S. for both on- and off-road diesels have increased since 2009, the association said. Outside of California, the 3966 DPFs were sold in 2012, down from 4777 in 2011, but in California, 7034 were sold in 2012, ahead of 2011’s 6729.

More information is available from the association’s website ( or on MECA’s diesel retrofit website at