Ok, so for months now, i have had these two codes. I have replaced, combi valve, secondary air injection solenoid, checked all hoses and all are new. Vagged and ran both the solenoid and air pump, both opperating. I had a maf code before any of this happened, replaced the maf and got these codes. Any help would be wonderful. Do these codes have any connection to one another? I have checked voltage to my post cat o2 sensor. Seems to hardly change voltage, which i believe is indicating that the 02 sensor is sticking and is bad. Please any help would be delightful.

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2001 Audi A4 B5 1.8 T Manual Trans Quattro