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That code is 99% of the time caused by the DPFE sensor. That is the sensor that monitors the amount of EGR opening.
Here is a better pic in which you can see the DPFE and the EGR vacuum regulator. The DPFE is the top one. Make sure all the hoses are properly connected then with a vacuum pump pump up the EGR as the engine is idling. If the engine runs rough or even stalls then the valve is working and the DPFE should be chanegd.
Locate the EGR tube going from the valve to the exhaust. There will ne two small rubber hoses going to the tube which will go to the DPFE sensor.