I just came from Lexus Parts where I know the parts guy for years. I told him my issue with the CEL coming on with code P0440 Evaporative Emmission System. I changed the cap, did the smoke test, changed almost all the vacuum hoses leading the the Vacuum Switch Valve as well as cleaned the VSV with WD40. I just recently cleared my CEL so I'm waiting for it to return. My parts guy did say they it was common for him to sell the VSV (part number 25860-50100) and occassionally an inexpensive pipe (part number 23818-46110). I did purchase and replace the plastic pipe today for $10 but the old one did seem clear from any debris. He really feels that the VSV is causing my CEL to come on due to the number or VSVs he has sold in the past. I may bite the bullet and go for the one shown on this thread at the discounted price. Is that one an OEM?

 

Hi, has the CEL been back since you serviced the VSV and replaced the hoses?

 

Has anyone that replaced the valve to new find a real difference. I’m not referring to cleaning it. I’m talking about replacing it.