EGR error Code help?

[MustangC4]

I am getting the following error codes on my sons 2000 Mustang:
P0401 - EGR flow insufficient
P0402 - EGR flow excessive

I like that, both insufficient and excessive flow...

Is there any way to distinguish between a bad EGR solonoid or the EGR itself???? No other error codes except the above two. I need to get this fixed so I can get his car inspected...Car will not be inspected until the "Check Engine" light is off.

Thanks in advance, I know little to nothing about Mustangs....

*******update*******
To test EGR, I let car idle, put on an open ended vacumm hose, lightly sucked on open end, and idle drops lower with increased vacumm(sucking...).... I then put my finger on the vacuum source which normally attaches to EGR valve, and I could feel light pulsating vacumm at idle, and almost no vaccum as I increased RPM

Don'y know if this helps......



-Mike

 

[Lsredy2kstang]

Just change the EGR and you should be fine.

 

[232_slowness]

get that a lot usually it's a DPFE. It's only about 50 bucks to replace. Takes about 10 minutes.