You need to fit new hoses there will be a leak, it needs to be air tight...
I'm also getting the 16795 secondary air injection system: incorrect airflow detected 2 P0411 - 35-00 - - code. I cleared it and it's come back a week later. After reading this thread I've just gone to check and my vacuum pipe has completely frayed through. (the same one as pictured in post #22). I'm ordering a length of pipe from eBay and will let everyone know how it goes. Hopefully the code will reappear over the next few days before I replace the pipe.