What does exhaust gas recirculation flow excessive detected mean?
What does exhaust gas recirculation flow excessive detected mean? P0402 is an OBD-II generic code that the engine control module (ECM) has detected indicating the engine exhaust gas recirculation (EGR) valve is flowing too much recirculated exhaust gases when it is commanded to open the flow of gases into the intake manifold. What does p0406 mean on an exhaust gas sensor? P0406 is a diagnostic trouble code (DTC) for "Exhaust Gas Recirculation Sensor "A" Circuit High". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation....