Helpful Automotive Resources
P0406 Code: Exhaust Gas Recirculation Sensor A Circuit HighDiagnostic trouble code (DTC) P0406 stands for “Exhaust Gas Recirculation Sensor A Circuit High.” It means that the powertrain control module (PCM) perceives a high voltage signal from the exhaust gas recirculation (EGR) position sensor.
Code P0406 means that your car computer perceives a high voltage signal from the EGR