Trouble code: PO0401

[KJ94GT]

Any ever pulled this code? It claims to be the EGR system insufficient flow or something like that. Someone on NLOC said it was the DPFE sensor. I'd rather spend the $$$ than to take it back to Middlecough (:D) and come out with another bent axle.

[L8 APEX]

Doug had an intermittent egr code a while back.

[KJ94GT]

Did he pull a PO0401 code? If so, what did he do to remedy?

If not, what did he do? :D