Guys, I really could use your help. Pretty frustrated since I have been challenged with the P0174 code since the summer. I used Rockauto to rebuild my MAF and the result? The CEL remains.

No vacuum leaks and I have poorer fuel efficiency, but otherwise the car runs well.

Innova scan reveals:

STFT B1 10.9
LTFT B1 10.9
STFT B2 12.5
LTFT B2 19.5
MAF (lb/min) 0.7

Could you all suggest anything else? Car still under warranty, but hate to tie it up at the dealer for an extended period of time and I would like to work on it myself.

Thanks so much!

Jeff

 

I like working on my R too but with a factory warranty I would use it. Did you pay for the MAF repair? Maybe you need a new one instead? The R is not known for MAF problems but is reported now and again.
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+1 on using the warranty.

Your LTFTs show you have either an air leak (probably, but what happens at 2500rpm?) or bad MAF or something else.

 

Seriously, check the air box and hose going to the throttle as well. Many times people think they are good and when double checked the box is not sealed properly or the air intake hose has a crack.

I've peeked under the hood of a few S's to find the air box cover not fully attached.