My check engine light is on and a code of p0401 comes with insufficient egr flow. I replaced the egr valve and the vacumn solenoid but the light still comes on. Any answers to my problem?
Check out this link below, maybe the sensor or switch. I went through this on my V10, checked the code, cleared the codes by disconnecting the battery a few times, always came back on a day later. All this around inspection time. Did nothing then it just went away, hasn't been back on for 6 weeks. It would usually come about once a year.
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