Bypass pipes installed! Now a problem?

[AndyA6]

CEL fixed!

Car was at the dealership and they replaced both secondary O2 sensors. The sensors worked but the heating element on both were shot. Even the tech who I know for many years was a bit baffled, he kinda suggested to put spacers in there..... he also thought that maybe the bipass pipes might be a reason, something like "less back pressure causes the heating elements to stay on longer thus causing possible damage" but we agreed that this is highly unlikely......

Let's see if the problem comes back.

Thanks all for the input!!