After having my check engine light on for some now showing p0401, I decided to compile all of the knowledge from the IH8mud forums into a troubleshooting video for anyone that has this diagnostic code. I go over what to look for first and what is basically free to do maintenance on, all the way up through replacing the system itself.

VSV relocation video:
   • 1997 Land Cruiser P0401 Vacuum Switch...  

Wit's end OEM Toyota Vacuum hose kit:
https://absolutewitsend.com/oemvac...