Because of the nature of an internal combustion engine, there will be harmful exhaust that must be emitted. A Toyota Sienna 1998 - 2000 Eastern catalytic converter can help to make it not so harmful. 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. They could even be deadly. Located at the front of your exhaust line, a Toyota Sienna Eastern catalytic converter vaguely resembles a muffler with its tubular appearance and the baffles that it contains inside. 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. You must find and then fix the underlying cause of the problem before changing out your Toyota Sienna Eastern catalytic converter so that it can do its job of keeping you and the environment safe for many years to come. Motor hobbyists deserve great customer assistance while looking at dependable auto parts for their car or truck. For our valued customers, we maintain a 24/7 support bureau to support you with your needs. If you spot a lower price elsewhere, tell us - we will beat any legitimate auto part price.