Ford PO401 Code – EGR Valve Issue or Something Else? Help Needed!

[Nicko]

I’m getting a P0401 code on my 2006 Ford Escape – Exhaust Gas Recirculation Flow Insufficient. I already replaced the EGR valve, but the code came back after a couple of weeks. Could it be something else, like clogged passages or the EGR sensor? What else should I be looking at?