P0401
Exhaust Gas Recirculation (EGR) Flow Insufficient
Emissions / EGR Guide under reviewThe module commands the EGR valve open under specific conditions and checks whether the expected change in intake pressure/temperature or EGR flow actually occurs. If the system can't deliver the commanded flow, this code sets.
Detailed diagnostic instructions are under review. The code remains available for identification and assistance.
A DTC does not prove one component has failed. Confirm the diagnosis and vehicle fitment before buying.
Parts commonly related to this fault
Fault → component → vehicle / VIN → exact part.
Possible related component
EGR Valve
Explore parts →Possible related component
EGR Cooler
Explore parts →Possible related component
EGR / Pressure Sensor
Explore parts →Related products / exact references
Catalogue references linked to this fault. Vehicle fitment still requires verification.
Exact product references have not yet been linked to this fault.
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