Hello, This Code means there is a problem with the Electric solenoid that controls Vacuum to your EGR valve. It can mean a vacuum line is off or the EGR valve itself is leaking.
If you have any Vacuum test gauges you should disconnect the vacuum line to the EGR and attach a vacuum source and try operating the EGR valve. If the valve moves and holds vacuum, then your problem is upstream in the vacuum lines and solenoid. If the EGR valve leaks and will not hold open with vacuum applied to it, the EGR valve is bad.
It is a little more difficult to test the solenoid because some engine controls will not activate the solenoid unless the car is in gear and above a certain speed. Some of the solenoids work on small voltage (3V) so applying 12 volts will melt the internal parts. Use an Ohmmeter for bench testing the Solenoid.
Many of the parts stores such as Autozone, Oreillys, and Advance have tool loan Programs which for a deposit, can supply you with test tools. The actual EGR may be tested if the counter-person will do it for you and can be done on the car. It varies place to place on what the stores policy is for testing.
I hope you found my solution very useful in fixing your vehicle.
SOURCE: I have a fail code (P1409) on my 1998 FOrd Expedition, 4.6L. Where can I get this part? Thanks, Alec
Code indicates bad EGR Vacuum Solenoid. Chilton lists possible causes below. Here's a link to the part you want. Best of luck!
Greg
http://www.rockauto.com/catalog/raframecatalog.php?carcode=1304402&parttype=4964&a=FRc1304402k943582
Possible Causes:
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what year and model engine transmission is this vehicle?
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