Originally posted by CarpePoon:
had a check engin light, code reader at autozone said "EGR valve flow excessive" So I bought a new EGR valve....reset the computer and I still get the check engin light. Anybody have any ideas what could be causing this code besides the EGR valve itself??
My bet would be that the EVR (EGR vacuum regulator) is bad.
Here is the text from the Ford Technical Service Publication (TSP)(I assume you received a P0402):
Diagnostic Trouble Code (DTC) P0402 indicates that Self-Test has detected EGR flow at idle.
NOTE:
If DTC P1405 is in Continuous Memory, diagnose that first starting with «HE50».
Possible causes:
-- EGR valve stuck open.
-- EGR vacuum regulator (EGR V.R.) solenoid vent plugged or iced.
-- EVR circuit shorted to GND.
-- EVR circuit shorted to VREF.
-- Pinched/iced pressure hoses.
-- Improper vacuum hose connection.
-- Plugged/pinched EGR V.R. vacuum hose.
-- Plugged EGR tube.
-- Damaged EGR V.R. solenoid.
-- Damaged Differential Pressure Feedback EGR (D.P.F. EGR) sensor.
-- Damaged PCM.
