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Major advances in TWC catalysis have been reported in the past several years. Possibly the most significant of these has been the development of high loaded Pd-only catalysts which demonstrate improved HC and light-off performance. Such systems have demonstrated the ability to meet California Low Emission Vehicle Standards without the need for electrically heated catalysts or hydrocarbon trap technology. The integration of improved low temperature catalyst performance with optimized catalyst substrate properties and vehicle calibration can result in further emission reductions. This paper describes the development of a low temperature Pt/Pd catalyst technology which offers light-off advantages over Pd-only catalysts.