Lean

2000 S4 tip with APR 93 program

Recently my CEL came on. Codes were 1128 1130. Lean fuel on right and left bank. I thought it was due to 92 octane accidently put in. Code cleared and light came back on.

I am wondering if I have a vacuum leak after I installed my boost gauge.


Any other suggestions ?

Could be your MAF, BPV or vacuum.

BPV are new.

How can I test vacuum or MAF ??


Thanks

I'd start by picking up a couple feet of vacuum line and replacing all that you can. The factory stuff gets brittle and cracks very easily. How much boost does your gauge say you are getting?

Here's an article to read.

Thanks for the info. Boost is between 15-17 psi, vacuum is 20.

I believe it is the MAF, beside the Stealership, where is a place I can buy this. None of the local shops can get it

I just bought a used one from an auto dismantler. I found them on www.car-parts.com. Think I paid 40 bucks for the maf. The dealer also sells a remanufactured MAF for like 80 bucks I believe.

Thanks, I went over to AudiWorld and looked up the procedure on how to clean the MAF. So far the CEL has stayed off.