Force Fleet TrackingDiagnostic Trouble Code (DTC) DetectedJetta 2013 Volkswagen is reporting DTC P0420: We have detected that the Catalyst System Efficiency is Below Threshold in Bank 1. This means that there could be something wrong with your catalytic converter and that your vehicleÆs emissions may be higher than what is legally allowed. This issue may have a moderate impact your vehicle's health.More details in the app.