I did the disa flap #139 vitron gasket fix 3 days ago and my service engine soon light finally went out. I had a vacuum leak from the original seal and dug out the orange seal on the disa and installed a #139 vitron gasket in it's place and saved me about $400-$500. Easy and sweet fix. The orange seal leaks as it ages and you get a lean code. I got 25 gaskets off amazon for $12. Stoked!