1997 Toyota Landcruiser Check Engine Light OBDII code P0401

what is the exact code all you say is P040

oops it is Error Code P0401 :?

Alright thats better :D

Simple code, it means EGR flow is insufficent.

first take off the egr valve and clean its ports and the ports on the manifold really well till its pretty well clean. then install a new gasket, after the old one is removed and the mating surfaces clean of course!

second if the above doesnt work Try manualy giving the Vaccum to the EGR and seeing if it opens up and runs good, if it does then you have insufficent vaccum to it and the lines shoudl be checked.

Third The DPFE sensor or the EVP sensor is bad and you should have those checked by a mechanic or dealership.

fourth, the EGR is just simply bad.

Thank you for you reply.
I went ahead and did a vacuum test on the EGR Vacuum Modulator Valve and I had flow into the A chamber, the port on the bottom. When I cleaned it out with air, the light stayed out. I replaced it anyway since it had a leak and changed some of the vacuum lines and the PCV Valve and hoses. It has been a week with no check engine light. Thanks for the input, it really helped me focus on the "right" area.

Glad to hear you have found your problem. it has been my pleasure.