Most guys probably all ready have herd about the new diesel smog program for California starting in 2010, but if not then here it is. Starting in 2010, all 1998 & later diesel powered on road vehicles 14K pound GVW and less will be “smog” tested (smoke guessed). Basically there are 3 parts to the program. First, the smog technician visually checks your vehicle for missing or modified equipment. Second, the smog technician hooks up a machine to the OBDII connector and scans for codes/check engine light. Third, the smog technician visually checks for smoke while revving up your engine between 2000 & 3000 RPMs and makes a guess as to whether it passes or not. No actual machine is used to test smoke color (density or opacity) and no actual gas analyst takes place, like what is done in a gasoline smog test. The California Bureau of Auto repair (BAR) came up with this “smog test” for diesels that does not require the smog station owner to purchase any additional equipment to do this test. In fact, the software upgrade to check for codes is suppose to be done for free for the station owners. Here is a link to the BAR site http://www.bar.ca.gov/80_BARResourc...ulatoryActions/FAQs for Diesels 1-8-09_GC.pdf I believe the BAR's intent is to target modified trucks, not clean up the air, otherwise the BAR would require an actual sniff test or opacity test like what fleets currenty have to go through once a year under the Calif Air Resources Board's Period Smoke Inspection Program (PSIP). I am working on a website to help guys out who fail the diesel smog check. I'll post a link once the website is up. In the mean time we got to figure out how to fight this baloney from the BAR.