Im getting a p1401 fault code when my ce light came on. I know its for the dpfe sensor but everything looks great. It does run a little rough and doesnt have much power but other than that it runs fine. Can anyone point me in the right direction. I read somewhere about cleaning carbon from the upper throttle body. Would that do any good.

 

DPFE(differential pressure feedback) sensor, is part of EGR(exhaust gas re-circulation) system

DPFE tells the computer(PCM) if EGR valve is opening and how much exhaust is flowing into the intake.

EGR system is only used after engine warms up and when engine is under a load.
Unless EGR Valve sticks open a faulty EGR system shouldn't cause any running issues, maybe Pinging/Knocking under lead.

Metal DPFE sensors had a tendency to fail sooner than Plastic.
The reason they fail is water intrusion.
DPFE sensor has 2 hoses that run to the exhaust system usually the EGR valves metal tube, one hose is closer to EGR Valve than the other, as EGR valve opens the closer hose will show more of the pressure drop than hose that is farther away, how much of a difference is what the DPFE sensor tells the computer, differential pressure feedback.

All exhaust has water in it, a byproduct of burning gasoline(H) with oxygen(O) this makes H2O, water, and this is why tail pipes drip water, and why exhaust systems rust from the inside out.

So the hoses to the DPFE sensor will have water vapor inside, after engine is shut off everything cools down, that water vapor will condense on coolest surfaces, which will be DPFE sensor's insides and the hoses.

So check that the hoses are clear and not broken, and most likely replace DPFE sensor.