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- Bowman, Zach. "What Does My Check Engine Light Mean?" DriveSide.com. (10/5/2009) http://www.driverside.com/auto-library/what_does_the_check_engine_light_mean-27
- "Check Engine Light: What Does It Mean." MechanicAdvisor.com. (10/7/2009) http://www.mechanicadvisor.com/content/check-engine-light.aspx
- Davis, Austin. "What Does My Check Engine Light Mean?" MyHonestMechanic.com. Nov. 22, 2005. (10/5/2009)http://www.myhonestmechanic.com/articles/check_engine_lights.shtml
- "On-Board Diagnostics." U.S. Environmental Protection Agency. Aug. 14, 2007. (10/7/2009) http://www.epa.gov/otaq/regs/im/obd/index.htm
- Is your car telling you something?" Road and Travel Magazine. (10/5/2009) http://www.roadandtravel.com/carcare/2008/check-engine-light.htm
- Kayne, R. "What Causes the Check Engine Light to Come On in a Car?" Wisegeek.com. July 23, 2009. (10/7/2009)http://www.wisegeek.com/what-causes-the-check-engine-light-to-come-on-in-a-car.htm
- Keen, Judy. "Older cars' emissions go unchecked." USA Today. June 18, 2007. (10/7/2009) http://www.usatoday.com/news/nation/2007-06-17-emissions_N.htm
- "What Does the "Check Engine" Light Mean and How Does It Affect My Emissions Inspection?" Georgia's Clean Air Force. (10/5/2009)http://www.cleanairforce.com/docs/checkenginelight.pdf
- "What to do if the "check engine" light goes on." Consumer Reports. March 2009. (10/5/2009) http://www.consumerreports.org/cro/cars/new-cars/news/2005/what-to-do-if-the-check-engine-light-goes-on/overview/index.htm