The primary task of the Volkswagen Golf Catalytic Converter is to convert toxic exhaust gases into much cleaner compounds before they move through the tailpipe. Hot exhaust enters a ceramic honeycomb covered with platinum, palladium and rhodium catalysts, where carbon monoxide and hydrocarbons are converted into water and carbon dioxide, and nitrogen oxides are reduced to harmless nitrogen. The three-way design is the only design that has been seen in both past and current Golf models and thus no significant design changes are captured, but individual units endeavor to achieve a compromise between low emissions and minimal back pressure. Clogs, melts or cracks in the substrate caused by misfires, excessively rich fuel mixtures, coolant or oil spills or road debris can cause power loss, rattles, sulfur smells, a glowing check engine light and even failure of a smog inspection. A Catalytic Converter that is clogged is similar to a blocked straw and causes the engine to strain. Previous models had been issued with a five to ten year or one hundred thousand mile warranty against emissions, which Volkswagen had placed to limit the warranty to the Catalytic Converter, which contained expensive precious metal hardware. Once that coverage runs out, replacement is expensive, and therefore Volkswagen owners will want to keep the engine in tune; this way converter efficiency is maintained, and the environment is not compromised by failing to fix leaks or misfires, which uphold the original low pollution promise that Volkswagen had given.
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