I have an A8 w/ the 4.2 so I figured some of you guys may be able to lend some insight on this concern. My main issue is that I'm trying to find the culprit of these two codes below.

P1136 (Fuel Trim: Bank 1 (Add): System too Lean )
P1138 (Fuel Trim: Bank 2 (Add): System too Lean )

My only lead is that measuring block 107 came up with "System Not Ok" Does anyone know what that means?

My B1S1 and B2S1 are over 10% in Block 032 which is tripping the CEL. I couldn't find any vacuum leaks and I installed a new MAF, Fuel Filter, & PCV Valve.

Click the link for Vag Blocks
http://i7.photobucket.com/albums/y27...c.png~original

Group 107 "System Not Ok" result
Group 107 is the O2 sensor air fuel control check.

Group 042 & 043
B1S1 = 78 ohms
B2S1 = 79 ohms
B1S2 - .10 Kohms = 100 ohms
B2S2 = .20 Kohms = 200 ohms

BLOCK 032:
Adaptation (idle) B1S1: 6.2%
Adaptation (Partial)B1S1: 12.5%
Adaptation (idle) B2S1: 6.0%
Adaptation (Partial) B2S1: 11.7%