P0401 Insufficient or Restricted EGR Flow. Typical vehicle diagnostic fault codes may include: #CAR SCANNER CHECK EGR DRIVER#The vehicle fault history may be logged in the vehicle engine control computer memory as fault codes, and also cause the dashboard engine management light (management information light - MIL) to come on to warn the driver that an emissions fault is present.Ī dashboard mil warning light illuminated may cause the car to fail mot test.Ī fault code reader connected to the vehicle diagnostic socket may be used to access fault code information and clear fault codes from ecu memory once the fault has been cured. The vehicle engine control computer may store a history of faults that have been detected during a journey (driving cycle). Loss of power making acceleration difficult Restriction of diesel engine air intake can cause running problems, loss of power and increased black smoke emissions.Įlectronic engine management systems calculate required fuelling from driver demand (accelerator pedal position),Įngine speed and position (crankshaft position sensor), and load by monitoring air flow volume in to the diesel engine using sensors such as :īlocked Exhaust Gas Recirculation (EGR) systems may be detected by the engine management control computer with effect that the engine control unit program reverts engine running to a limp home function by restricting power output. Vehicle engine air intake can be restricted by Carbon build up caused by exhaust gas recirculation. Vehicle Diagnostics Shropshire Fault Code P0401 and P0405 Exhaust Gas RecirculationĮngine exhaust gas recirculation (EGR) systems are designed to circulate exhaust gases back into the engine intake to burn soot and reduce exhaust emissions.
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