Lambda sensor bad?

[ronenfe]

After replacing the donut, It still has a leak, So I am trying to put the same sealant that i'm going to use for the oil pan - under the donut, Reinzosil, it says it's up to 300 degrees, I hope it will work, at least for now. The manifold gasket seems to seal after I tightened the nut a little more. And I found another seal from near the lambda sensor where there was a welding there. I put Loctite weld on it and I hope it will hold also for now.