About a week ago my car went to limp mode Sucks... i took it to my mechanic and he said these codes are on

P0422/16806
17536/p1128

I know ones the cat Cause of my DP but whats the other he said it could be my O2 sensor or i might have a leak in my BOV pipes What do u guys think

 

Most likelya dirty maf or vac leak. Clean it and reset the code and if it comes back, look for a vac leak.