how many catylitic converters are on this car 4 cylinder 2.0L engine

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have had the car diaganosed for a 420 converter code and established that it was over fueling due to wrong plugs. replaced the plugs and decarbonized the engine and converter. Converter code came back on and fear the over fueling damaged the converter. was told we have a minifold converter and then told by the dealer his diagrams are showing 2 converters. how many are there