How many catalytic converters does it have?

tarheel person,looks like 4,but that code does not mean for you to replace all 4 or even 1.left front,left rear,right front,right rear.they make a direct fit replacement 1 for each side.it replaces the front and rear on each side as one per side.but make sure you read this and take to trusted shop with scan tool with live data,before you start throwing $1500.00 at it and not fix it.copy and paste the link.P0421 Volkswagen Warm Up Catalyst Efficiency Below ... engine-codes.com/p0421_volkswagen.html P0421 Warm Up Catalyst Efficiency Below Threshold Bank … engine-codes.com/P0421.html another link added