Exhaust gas recirculation: Returns a controlled portion of exhaust gas to the intake to reduce nitrogen oxide (NOx) emissions.
Exhaust gas recirculation
Returns a controlled portion of exhaust gas to the intake to reduce nitrogen oxide (NOx) emissions.
P0401 alone does not prove a faulty valve: deposits, restricted passages, control or measurement faults are possible.
A component or system name does not prove that the part has failed. Read the complete code, symptoms and live data, then follow documentation for the exact engine and equipment.
Examples for understanding the system, not a complete list or a diagnosis.
P0401P0402P2002