Volvo Lover but have a Mercedes Problem
 

I am a huge Volvo Lover and Have right know 3 volvo love them.. I've have inherited a 1999 mercedes S500 The car is in mint condition excellent running suspension the car feels great but the check engine light is on with these codes the car is runnning perfect no misfiring anything just the check engilne light is bugging me off I can defend myself in fixing up the car as i have done it several times with volvo but i wondering if u could help to point sometrhing out on how to start with this kind of codes

p0410 Secondary Air Injection System Malfunction
P0422 Main Catalyst Efficiency Below Threshold (Bank 1)
P0432 Main Catalyst Efficiency Below Threshold (Bank 2)

any help will be truly appreciated