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    Thread: My JB needs some input guys..... first CEL code ever P0172

    1. Member phat8186's Avatar
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      Oct 8th, 2007
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      JB 20th/E92 335i/B5s4
      02-23-2012 01:55 PM #1
      Ok I just threw my first CEL code ever on my JB 20th. She is just shy of 75k mileage wise, her modes are full 42dd 3inch street exhaust along with neuspeed Pflow intake.
      Just read the CEL and its only throwing P0172

      P0172 - System Too Rich, Bank 1

      Possible Symptoms
      Irregular behaviour

      Possible Causes
      Fuel system
      Excessive fuel pressure
      Leaking or contaminated fuel injectors
      Leaking fuel pressure regulator
      Low fuel pressure or running out of fuel
      Vapor recovery system
      Air leaks after the MAF
      Vacuum leaks
      Improper seated engine oil dipstick
      Stuck EGR valve
      Oil overfill
      Cam timing
      Cylinder compression
      Exhaust leaks before or near HO2Ss.

      Any of you guys have some insight on how I should tackle this little prob.
      Jazz blue 20th 78,xxx Sold 6/9/12
      42 Draft Design 3inch Turbo Back, Neuspeed P-Flow intake
      BFI Stage 1 Dogbone Insert
      Custom Boser Hood, Helix HID w/ 6000k HID kit

    2. Member phat8186's Avatar
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      JB 20th/E92 335i/B5s4
      02-23-2012 02:00 PM #2
      I have been using the search button and I am reading that it could be MAF related........ any other thoughts would be great
      Jazz blue 20th 78,xxx Sold 6/9/12
      42 Draft Design 3inch Turbo Back, Neuspeed P-Flow intake
      BFI Stage 1 Dogbone Insert
      Custom Boser Hood, Helix HID w/ 6000k HID kit

    3. Member
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      '99.5 2.0 Jetta (sold) '03 20th imola GTI (sold) '02 1.8t Jetta, 2012 2.0T GLI
      02-23-2012 02:49 PM #3
      you can check your maf and see if its clean but if the fuel is running too rich my opinion its would be the oxygen sensor dont remember which one it would be though, one is pre cat and the other post cat which is on the exhaust.. when one goes out fuel runs rich, the other it would be too lean

    4. Member phat8186's Avatar
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      JB 20th/E92 335i/B5s4
      02-23-2012 04:37 PM #4
      Quote Originally Posted by dangxiii View Post
      you can check your maf and see if its clean but if the fuel is running too rich my opinion its would be the oxygen sensor dont remember which one it would be though, one is pre cat and the other post cat which is on the exhaust.. when one goes out fuel runs rich, the other it would be too lean
      I will check the MAF first thing this weekend and see whats up. As for both o2 sensors they are both brand new as of this summer, I couldnt imagine they be shot already.
      Anyone else want to chime in on this one.
      Jazz blue 20th 78,xxx Sold 6/9/12
      42 Draft Design 3inch Turbo Back, Neuspeed P-Flow intake
      BFI Stage 1 Dogbone Insert
      Custom Boser Hood, Helix HID w/ 6000k HID kit

    5. Member
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      2005 jetta GLI
      02-23-2012 05:44 PM #5
      I got the same code a couple years back. My car would go into limp mode under heavy acceleration. P0172 is the only code it came back with. I had a bad MAF. Having said that, its a very diverse code that could mean lots of things. Did you get the code read at Autzone, Oreillys, etc?
      05 GLI Upsolute 93 program, p-flo intake, forge DV, forge TIP, 3" TB exhaust, Eurojet FMIC

    6. Member BRANT#2766's Avatar
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      '03 20th anniversary GTI(F23 build), '87 Cabriolet, '09 KTM SMC 690, and HERS '03 Jetta TDI.
      02-24-2012 12:37 PM #6
      check your connections on your 02 sensors. i replaced my front one on the same code a while back, and a week later the same problem came back. put my car back on the lift and found that it had came loose where it plugs in. good luck!

      FYI i also had to replace the MAF not to long ago and when i put the new one on, the plug on top was standing almost straight up, made the problem worse after alota head scratching i rolld the MAF back on anout a 45 degree angle like it was before, fixed it! those things are aparentley super sensative!

    7. Member s.tran's Avatar
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      2002 Gti 337
      02-24-2012 02:11 PM #7
      Its most likely your MAF, I have a 337 and just had this same exact problem, the car would throw itself into limp mode and only allow 5psi. I did some search on here and checked my MAF and cleaned it. be careful because if you dont clean it the right way you can damage the sensor and have to buy a new one. After i did that no CEL no more and car was good again.

    8. Member phat8186's Avatar
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      JB 20th/E92 335i/B5s4
      02-25-2012 10:00 PM #8
      Update:
      Took the MAF sensor off cleaned it with some electrical cleaner and reset the CEL. So far all is good
      Jazz blue 20th 78,xxx Sold 6/9/12
      42 Draft Design 3inch Turbo Back, Neuspeed P-Flow intake
      BFI Stage 1 Dogbone Insert
      Custom Boser Hood, Helix HID w/ 6000k HID kit

    9. Member Zach!'s Avatar
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      GLI+
      02-27-2012 04:08 AM #9
      Boost leak?
      #FlossFilthy
      #Cliqve
      #Joosey
      ig: @zachca

    10. Member phat8186's Avatar
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      JB 20th/E92 335i/B5s4
      02-27-2012 11:26 PM #10
      Quote Originally Posted by Zach! View Post
      Boost leak?
      No boost leak here, did intake pressure test god I love this sight so informative.....
      Jazz blue 20th 78,xxx Sold 6/9/12
      42 Draft Design 3inch Turbo Back, Neuspeed P-Flow intake
      BFI Stage 1 Dogbone Insert
      Custom Boser Hood, Helix HID w/ 6000k HID kit

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