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    Thread: P0170 Fuel Trim Malfunction Bank 1 on '01 GTI

    1. Member
      Join Date
      Jun 8th, 1999
      Location
      Boston, MA
      Posts
      1,255
      Vehicles
      2016 GTI SE 6M
      06-03-2010 03:06 PM #1
      I have this error code on my '01 GTI. I have searched for vacuum leaks. I just replaced the MAF and cleaned the throttle body. I still get this code intermittently every 3 weeks or so. Any ideas?
      Last edited by olaf; 06-05-2010 at 07:40 PM.
      16 GTI SE 6M 7,5k
      sold mk4 vr6, mk4 1.8T, & mk6 GTI
      06 Chevy Colorado 4x4 5M 84k

    2. 06-03-2010 04:45 PM #2
      what does your block 032 read? are you misfiring and getting backfires?
      MK4 Junker : PAG 50trim Kit : AEB : RMR : Eurodyne
      P.P.T. - Pag Parts Turbo
      B6 A4 : Slow

    3. Member
      Join Date
      Jun 8th, 1999
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      2016 GTI SE 6M
      06-05-2010 10:13 AM #3
      The car runs quite good. What seems to happen is that every few weeks the car momentarily loses power, the CE comes on, and then everything goes back to normal.

      I am replacing the 3-way crankcase ventilation hose today. It is practically collapsing. I wonder if that could cause the problem? I am also going to clean the pancake valve while I am in there. I will check the readings on block 032 and report back.
      16 GTI SE 6M 7,5k
      sold mk4 vr6, mk4 1.8T, & mk6 GTI
      06 Chevy Colorado 4x4 5M 84k

    4. Member
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      2016 GTI SE 6M
      06-05-2010 02:02 PM #4
      Okay I replaced the hose and cleared the codes. I checked Block 032 and I am reading 0% in both fields. Hummm. I am not sure if the problem is fixed, but I will monitor and check back later if I get an error code.
      16 GTI SE 6M 7,5k
      sold mk4 vr6, mk4 1.8T, & mk6 GTI
      06 Chevy Colorado 4x4 5M 84k

    5. 06-05-2010 02:06 PM #5
      When you clear codes you reset your adaptation. You just blew up your old fuel trim values by doing that. drive it for a week and report back. I believe half of '01s have a wideband primary O2 sensor, assuming you are wideband when's the last time you had that sensor changed?
      MK4 Junker : PAG 50trim Kit : AEB : RMR : Eurodyne
      P.P.T. - Pag Parts Turbo
      B6 A4 : Slow

    6. Member
      Join Date
      Jun 8th, 1999
      Location
      Boston, MA
      Posts
      1,255
      Vehicles
      2016 GTI SE 6M
      06-05-2010 05:27 PM #6
      I recently purchased the car, but the cat and 02 were replaced last year.

      Now I am getting a 17705 - Pressure Drop between Turbo and Throttle Valve (check D.V.!)
      P1297 - 35-00 - -

      It hasn't yet tripped the CE, but it stores the code. I think I still have a bad hose somewhere. The lower crankcase breather hose (the weird plastic one) feels real mushy.

      Here is what I have done so far:

      new coil packs (5 months ago)
      new coil overlay harness (5 months ago)
      new MAF
      cleaned TB (both mechanical & electrical) & ran adaption
      replaced upper 3-way valve cover hose
      cleaned pancake valve (it looked fine)
      inspected diverter valve (but i suppose it could be bad)

      The car seems to operate fine, so this has got to be just a stupid vacuum leak somewhere, no?
      Last edited by olaf; 06-05-2010 at 07:41 PM.
      16 GTI SE 6M 7,5k
      sold mk4 vr6, mk4 1.8T, & mk6 GTI
      06 Chevy Colorado 4x4 5M 84k

    7. Member
      Join Date
      Jun 8th, 1999
      Location
      Boston, MA
      Posts
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      2016 GTI SE 6M
      06-12-2010 03:24 PM #7
      Update:

      After replacing both the upper valve cover breather hose and the lower plastic breather hose, I was still having the 17705 pressure drop problem. So I replaced my MAF with my original MAF and re-aligned the throttle body. Now I am not getting any error codes. I think the replacement MAF was bad.

      I have checked all sorts of values. My MAF idles in the proper range of 2-4 and will go up to like 100+ when under full acceleration. So I think it is okay.

      As for the fuel trims, before I realigned I was at 1.3% and -3.1%.

      I logged misfires and I get none. Occasionally, like once every 10 minutes of driving I will see one misfire on a cyclinder, but then it goes away. Sometimes I see none. Is this normal?

      I guess I am just going to drive for a bit and see what else trips. Really weird.
      16 GTI SE 6M 7,5k
      sold mk4 vr6, mk4 1.8T, & mk6 GTI
      06 Chevy Colorado 4x4 5M 84k

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