A BMW 318I DEC catalytic converter is a wonderful thing. Your ride’s exhaust naturally contains carbon monoxide, hydrocarbons, and nitrogen oxide. Each one of these elements alone could cause serious problems for your health and the environment, especially the ozone layer. Located at the front of your exhaust line, a BMW 318I 1998 catalytic converter vaguely resembles a muffler. As the exhaust flows through it, chemical reactions occur changing these harmful elements into less harmful ones. It turns carbon monoxide into carbon dioxide, nitrogen oxide into nitrogen and oxygen, and hydrocarbons into water. Failure of this automotive component is caused by a fuel mixture that is too rich. That too rich mixture can in turn create heat stress. This problem could be caused by an emission of too much unburned fuel, your computerized controls could be sending too much fuel into the combustion chamber, or your fuel injectors could have problems. The underlying cause of the problem needs to be discovered and fixed before changing out your BMW 318I DEC catalytic converter so that it can function properly and last you a long time. Auto part customers always want terrific technical help when ordering reliable car parts. Thus, we established an always-open support and help desk to help you with your requests. If you find a better price, let us know - we will beat any advertised price for auto parts.