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Q:

service eng light on 1998 Nissan Sentra

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
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.
(1) Answer
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/