HELP !! Code P0402 EGR "A" Flow Excessive Detected , put new Egr Valve and vacuum hose on . Took battery cables off for 15 mins , AND !! check engine light back on , dratttt!
Not to goodl at elec stuff ,have multimeter , any good ideas what is up , or what I'm doing wrong . 1998 F-150 4.6 engine , 148xxx milies
Thanks a bunch for any help
Wayne

 

Possible causes:

• EGR valve stuck open.
• EGR vacuum regulator solenoid vent plugged or iced.
• EGRVR circuit shorted to GND.
• EGRVR circuit shorted to VREF.
• Improper vacuum hose connection.
• Plugged/pinched EGR vacuum regulator Solenoid vacuum hose.
• Plugged EGR tube.
• Damaged EGR vacuum regulator solenoid.
• Pinched/iced pressure hoses.
• Damaged differential pressure feedback EGR (D.P.F. EGR) sensor.
• Damaged PCM.

In my experiences with that code, 99.9% of the time it was a bad DPFE sensor, remove both hoses and electrical connector for the sensor and tap it on a table or something, if any moisture comes out, replace it and retest.
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