The DTC code P0401 states the exhaust gas recirculation flow is insufficient and it could be a faulty sensor or solenoid. Does anyone have any idea which sensor needs replacement?

Asked by Feb 08, 2014 at 01:50 PM about the 2004 Mercury Mountaineer 4 Dr STD SUV

Question type: Maintenance & Repair

1 Answer

75,775

Sounds like the EGR (Exhaust Gas Recirculation) valve and/or tubes are clogged. HTH. -Jim

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