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The Diesel Oxidation Catalyst (DOC) is an important technology for the removal of CO and hydrocarbons (HC) from the exhaust of diesel engines, as well as for generating exotherms for active regeneration, and for producing NO₂ used by downstream components. This paper describes the development of a one-dimensional numerical model for a Pt-Pd DOC for use in designing aftertreatment systems. The model is based on kinetics developed from laboratory microreactor data. The model is a significant advance over previous DOC models we have developed. A much larger experimental matrix was used enabling the kinetics and inhibition effects to be much better defined. The experiments included rich conditions enabling the model to be used in NOX trap systems, where the exhaust becomes rich during regeneration. Reduction of NO₂ to NO by CO and HC has been included in the model.