That code is for the PFE/DPFE Sensor which measures the amount of exhaust flow to the EGR valve.
First, you need to check the hoses on the DPFE Sensor and make sure they don't have any holes or leaks.
Next, remove the hose that goes down to the exhaust manifold and make sure its not blocked.
After that, its time to replace the sensor.
Honestly......if the hoses don't have any holes or cracks, I'd pick up a DPFE Sensor a swap it out, but good luck, its a PITA to get to.
To check the hoses, get a flash light and a mirror, you'll find the Sensor on the back of the driver's side cylinder head. Its a silver rectangle box with 2 hoses coming out of the bottom, one small and one a bit bigger. The hoses should be an orange color. Check them and make sure they are cracked or broken. The sensor is held on by two(I think) 3/8" nuts.
Let me see if I have a picture.............nope, not a good one.