There is a green tube coming off the side of my egr valve and it seems to be cut will replacing this tube solve my check engine problems

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Question moved to model category.

3.9L EGR valve location

Dakota Durango Forum https://www.dakota-durango.com > threads > 3-9l-egr-...
OBD-II trucks (96 and up) didn't have EGR any longer. If it did it would have a tube coming off the passenger side exhaust manafold and running to the EGR valve ...

2000 dodge dakota egr valve location

Fixya https://www.fixya.com > ... > Cars & Trucks > Dodge
4 hours ago - On a 2005 Dakota with 4.7 liter engine (non-HO), the EGR valve is located near the intake manifold on the driver's side right up against the ...

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Not easy to see, but on drivers side of engine underneath intake manifold, so look for airflow intake tube, the larger air tube, and it is just below and to the firewall about middle of engine top to bottom. Hose comes out of it and two bolts hold it in, pretty easy to see once you know where it is located, but difficult to change. Sometimes just cleaning hose out will solve problem. Worth a try to buy EGR cleaner and spray and run a wire inside hose to loosen up carbon.
CERACOAT-NANOTECH.com

On your EGR tube you have two hoses coming off of it. If you put them on in reverse you will get a code of insufficient flow. I put headers on and replaced EGR tube and valve and the flow sensor and that's the code that I received switched the hoses and solved the code

Most high-end scanners can activate the EGR. valve to see if it's working right. If it tests OK, then it may be a plugged port in the intake manifold which needs to be cleaned. The only reason to replace the tube would be either it's collapsed, blocked or corroded through.
If you do need a tube, you can order them direct from a Toyota Dealer, or from Toyota's Web site.

The problem is that your EGR valve needs replaced. What these do is they allow a precise quantity of exhaust back into the intake manifold; Provides a great help for an efficient combustion process and improved engine performance, when thes go bad your perfomance drops off and it does not run as clean.
The EGR valve, or Exhaust Gas Recirculation valve, is a vacuum-controlled valve which allows exhaust back into the intake manifold in controlled amounts. The EGR valve can clog and get contaminated over time by carbon buildup, at which point it will require replacement. A malfunctioning valve can cause the engine exhaust pressure to drop and send engine warnings to the computer. It can also cause engine back pressure to drop, reducing gas mileage and engine
This is for a dodge ram, as I have no idea what car you have but this is a general tip.

Locate the EGR valve in the engine bay. The year and make of the Dodge vehicle determine where the valve is located. This is on the front of the engine block, next to the timing belt in model-year 2005 and newer trucks. In older vehicles you will typically find the valve behind the engine, near the firewall.

Unclip the exhaust tube from the side of the valve. You can do this by hand. Shift the tube from side to side until it slides off.Use a flat-head screwdriver to remove the EGR valve from the exhaust tube. There is a screw on each side of the tube.

Disconnect the harness from the EGR valve. Use your hand to pull up on the tab and slide the harness from the valve.

Use a flat-head screwdriver to remove the two screws that secure the EGR valve to the cylinder head. Remove the EGR valve and clean the surface of the cylinder.

Attach the new EGR valve to the cylinder head and tighten it down with the same screws that were previously installed.

Reattach the harness and reattach the exhaust tube to the valve. Tighten the two flat-head screws that hold the tube to the valve.

Reattach the hose to the valve and use your hand to attach the clip to the hose.

P0401 OBD-II Trouble Code - Insufficient EGR Flow

What does that mean?
EGR stands for Exhaust Gas Recirculation. It is part of the vehicle emmissions system, and is used to reduce combustion temperature and pressure to control Oxides of Nitrogen. There are generally three parts to the EGR system: the EGR valve, an actuator solenoid, and a differential pressure sensor EGR (DPFE).

These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0401 code means that OBD detected an insufficient amount of EGR.

Symptoms
You may notice drivability problems such as pinging (a.k.a. pre-ignition knock) when the engine is under load or the vehicle is at higher speeds. There may also be other symptoms.

Causes
A code P0401 most likely means one or more of the following has happened:
* The DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced
* There is a blockage in the EGR (tube), most likely carbon buildup
* The EGR valve is faulty
* The EGR valve may not be opening due to a lack of vaccuum

Possible Solutions
In fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.
* Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open
* Clean out the EGR valve and/or tubing to remove deposits
* Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model)
* Replace the DPFE sensor (with a good quality / OEM one)
* Replace the EGR valve

Re-Check the possible solutions and tell us news (remember rated this).

Check in the drivers side rear of engine take off the air housing and use 13mm. deep socket w / 3inch ext. and air ratchet to remove 2 bolts, then take tire off inner splash panel then 8mm wobble w / 24inch ext to take 1 tube bolts loosen other one and pull out as ***. Reverse to install.

Hope this help to solve it (remember rated this post).

P0401 OBD-II Trouble Code - Insufficient EGR Flow

What does that mean?
EGR stands for Exhaust Gas Recirculation. It is part of the vehicle emmissions system, and is used to reduce combustion temperature and pressure to control Oxides of Nitrogen. There are generally three parts to the EGR system: the EGR valve, an actuator solenoid, and a differential pressure sensor EGR (DPFE). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0401 code means that OBD detected an insufficient amount of EGR.

Symptoms
You may notice drivability problems such as pinging (a.k.a. pre-ignition knock) when the engine is under load or the vehicle is at higher speeds. There may also be other symptoms.

Causes
A code P0401 most likely means one or more of the following has happened:
* The DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced
* There is a blockage in the EGR (tube), most likely carbon buildup
* The EGR valve is faulty
* The EGR valve may not be opening due to a lack of vaccuum

Possible Solutions
In fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.
* Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open
* Clean out the EGR valve and/or tubing to remove deposits
* Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model)
* Replace the DPFE sensor (with a good quality / OEM one)
* Replace the EGR valve

Hope this help to solve it; remember comment and rated this help. TY for using Fixya.

The EGR and the lift sensor may look perfect from the outside but the under side of the EGR valve and the EGR passage (small tube) are the REAL WORKING parts.

The carbon inside the EGR passage tube and the underside of the EGR valve must to clean out.

Make sure you has a NEW EGR gasket before you start the job.

It's a 2-3 hours job.

If you do not clean the EGR passage tube the Nox emission will get higher (check you past emission reports).

EGR VALVE IS #2.

Please wait for second post to answer your second question....comes with a few pictures.