My 1998 Toyota Avalon check engine light is on! Help!

In defense of SeaFoam products - it is a good preventative maintenance fuel stabilizer that is used primarily in the small engine / boating industry.. “Preventive” - - it is not designed to be a cure for an existing problem and must be used as directed - as with most products!

Yes, every product has a use. Unfortunately, many products that have value are often marketed for purposes that they are not useful for, and in some cases can cause more troubles.

Exactly! There is no such thing as magic in a can - related to automobile ‘repair’..