Excalibur

Ok, long story short, I bought a 01 SS A4. SES light was on. As far as I know of everything is stock execpt K&N filter and SLP LM exhaust. I cut the air box and did a TB bypass. I had the car scanned and these were the codes: P0102(MAF Circuit Signal Low), P0135, P0141, P0155, and P0161(All O2 Sensors). Looked for air leak and found nothing, checked fuel pressure and checked out fine at 50, even cleaned entire MAF. Cleared codes after doing all that and same thing. Just went ahead and bought new OEM MAF, Bosch pre-cat O2s and post-cat O2 Sims. Waiting on Sims to arrive but have already put in pre-Cat O2s and MAF. Reset PCM and I figured the SES light would reappear due to post-cat O2s and it did. Can't get the car scanned again until sometime next week. My question is, if the same MAF code is appears again, where do I go from here? Sorry so long but I thought the more info the better. I hope this isn't too much and any help is greatly appreciated. Thanks so much!