Ok so i have a 2005.5 S4 and i have the usual intake, catless DP to full exhaust, and i just recently installed the JHM Plenum spacers since i was replacing the oil filter housing o-rings. For awhile i was always clearing the light for a bad sensor that i probably banged around a little too hard during install. So i replaced both sensors but still consistently showed a code for bank 2 too lean. I kept reading about vacuum leaks and since the hoses are so small and brittle i figured one is leaking. I re checked everything and re tightened the manifold and still ran into the same code. I also heard it could be the MAF but it never threw a code for the MAF and i didn't want to throw money blindly at it. BUT i work in a dealership so i picked up a aftermarket BOSCH one for relatively cheap. I replaced the MAF and BAM its fixed! no more light or anything. I just wanted to post up my issue and what i did to fix in hopes it can help someone else!
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) 2005.5 Audi S4
2011 Dieselgate Q7 TDI..... patiently waiting for my warranty to expire!!
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