So I have been battling this error for some time and today I decided to add some seafoam to the vac line. I did not add much only 3oz but I noticed that there was smoke appearing from this area.



The area appeared wet also which I assume that it was from the seafoam but then dried as the engine got warmer. Also the smoke did not appear to be coming up from the CAT but under the engine. Now that the seafoam is out of the system it is no longer smoking and I cannot tell where the leak is. Before I start taking apart everything in this area does anyone have any suggestions of what I should replace.

Thank you for any help.