All models are equipped with an underfloor catalytic converter. The converter contains pellets coated with the catalyst material containing platinum and palladium. The converter reduces hydrocarbon and carbon monoxide emissions by transforming them into carbon dioxide and water through a chemical reaction which takes place at great heat.
Unleaded fuel only must be used with converter equipped cars because lead in leaded fuel is not consumed in the combustion process and will enter the converter and coat the pellets, eventually rendering the catalytic converter useless for emission control. To ensure the use of unleaded fuel only, all models have a small diameter fuel inlet filler which will accept only the smaller unleaded fuel nozzle.