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Yes the VSV is normally the cause for that code. If you have a volt meter and a vacuum hand pump I can show you how to test it
I don't right now, but could get one tomorrow or the next day
Here is the test procedure to see if the VSV is the cause.
Am I checking the vsv or the vps
you are checking the VSV
the VPS and VSV are the same thing
Is the vav for the egr located on the front of the motor or on the fire wall
The illustration in the above answer is for checking the MAP sensor which has nothing to do with the P0401 trouble code, although the EGR vsv can be the problem because they can have intermittent problems the most common cause for the 401 code is the EGR vacuum modulator valve which is connected directly to the EGR valve by a spring bracket and has three small vacuum hoses and an exhaust back pressure hose on the bottom. The modulator valve has a plastic cover on top, remove this cover, there is a fiber filter inside, remove this filter and check to see if there are any burned spots , if so replace this valve.