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The is an EGR VSV that controls vacuum flow through the EGR modulator then through the EGR. check the EGR VSV located below the cover on the left side.
by left side you mean passenger side? Then it's right side
I've taken off VSV that was on top of canister and it seemed to be plugged. I blew air through it and checked that it works. I've reinstalled back on the car and P0401 code hasn't been back on for 4 or 5 days, then it came back on. I've ordered part online and will replace this vsv and see if it will cure the problem.
The is an EGR VSV that controls vacuum flow through the EGR modulator then through the EGR. check the EGR VSV located below the cover on the left side.
I can't get cover off, seems like bolts are stripped. What's the best way to get this cover off?
I had a few 1mz's with that code and it was always the modulators. Going to the junk yard and seeing them missing off all the motors should tell you something