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service eng light on 1998 Nissan Sentra

I have this light on in my dash, end i do diagnostic test, end
the answer was: low flow detected, end 4 probable cause:
EGR-passages blocked
EGR-pintle stuck closed
EGR-volume control valve open or shorted
EGR-temperature sensor error.
So; my cuestion is, how i know wich is the real cause of my service eng light.

Asked by for the 1998 Nissan Sentra
Sounds like the EGR passages are blocked and causing the check engine light to come on New EGR valve is $150 to $200 at the parts stores but its $107 at http://www.parts.com/