Fourtitude.com - 2.0tsi vacuum leak after stage 1 APR tune
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    1. Junior Member
      Join Date
      Jun 5th, 2018
      Location
      Grand Rapids, MI
      Posts
      36
      Cars
      2009 CC 2.0T Stage 1 APR 6MT
      12-24-2018 04:31 PM #1
      I recently got a stage 1 apr tune, and a 2009 CC, and the car was pulling great until I blew something. I got CELs for p0101 (maf sensor), p0172 (system too rich bank 1) and p0299 (underboost). I also got a high pitched whistle when I called for a lot of boost. Figured it was the diverter valve, so I replaced that, which did nothing. Next, I replaced the PCV valve, which got rid of the p0299 underboost code, but I still have a whistle, a noticeable lack of boost (especially at higher rpm), and codes p0101 and p0172. I tried cleaning my MAF sensor and taking apart my cold air intake and putting it back together, but the problem persists.

      Any ideas guys? Im thinking that I have a vacuum leak and that I might have to take it to the dealership to get smoke tested. Also, are there any components which are especially prone to failure after stage 1 software? Any guidance would be greatly appreciated

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    3. Junior Member
      Join Date
      Sep 23rd, 2016
      Location
      St. Louis, MO
      Posts
      57
      Cars
      2015 Passat
      12-24-2018 07:44 PM #2
      Let it run and listen around all the intake piping including after the turbo.


      Sent from my iPhone using Tapatalk

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