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    Thread: Oxygen Sensor Problem on my GTI 1.8T

    1. Junior Member
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      09-06-2010 11:41 PM #1
      Hey guys,

      I had a problem on my GTI a month ago with this code:
      1 Fault Found:
      17536 - Fuel Trim; Bank 1 (Mult): System too Lean
      P1128 - 35-00 - -
      Readiness: 0000 0000

      I just replaced pre & post oxygen sensor this afternoon and drove about 10 miles after yet CEL did not turn off. Do I need to physically erase the code or will it go off eventually?

      Thanks for the help in advance.
      Don

    2. Member jetta2.8's Avatar
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      09-07-2010 11:33 AM #2
      If you have an aftermarket intake, or exhaust, you may need to install a oxygen sensor spacer to keep it from throwing codes.

    3. Member 01TornadoWolf's Avatar
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      09-07-2010 03:40 PM #3
      either go to autozone and have them clear your codes or just unplug the battery for a bit...

      also, did you rule out a bad maf??
      http://wiki.ross-tech.com/wiki/index...6/P1128/004392

      clear the code and see if it comes back, report back
      Last edited by 01TornadoWolf; 09-07-2010 at 03:43 PM.
      | 802 |

    4. Junior Member
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      09-15-2010 02:31 PM #4
      Thanks for the comment guys.

      I scanned my car again this morning and the problem seems to get bigger & bigger.

      I will release the code once I get back from work but these were the issues:

      Pre-Cat o2 sensor: No activity - Intermittent.
      Post-Cat o2 sensor: open circuit - Intermittent.
      Secondary air injection bank 1 leak detected - intermettent.
      System too lean.

      On my way to work this morning, the car randomly changed from normal to limp mode and back several times. Sometimes I've got 5 psi and 16psi.

      I've looked on this forum and this does not seem to be a common issue. Someone replaced ECU but I highly doubt that my ECU is causing this mess.

      Does anyone know how the o2 sensor harness wires are connected to the ecu? maybe the cable is coming loose and needs to be just re-connected?

      Keep me posted and thanks for the help in advance.
      Don

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      09-15-2010 02:34 PM #5
      FYI: My previous post

      I replaced my dead post o2 sensor 4 days ago and it got rid of the CEL until it came back today.

      This is what I got this evening:

      17526 - Oxygen (Lambda) Sensor Heating; B1 S2: Open Circuit
      P1118 - 35-10 - - - Intermittent
      16518 - Oxygen (Lambda) Sensor B1 S1: No Activity
      P0134 - 35-10 - - - Intermittent

      I did Readiness testing and I found that the voltage for Post o2 was jumping up and down like crazy. Sometimes the reading would jump up to .7-.890v range then it all of sudden drops to < .1 then goes back up. (Later I found out that 2 sensors were randomly shutting on/off without me doing anything.)

      I am suspecting that it's the hardness or the wiring itself that is causing this problem. How do I make sure of this so that I don't make a mistake? I just bought the o2 sensor a few days ago so its unlikely that it's o2 sensor again but I would like to make sure.

      Thanks!
      Don

    6. 09-15-2010 02:48 PM #6
      Quote Originally Posted by donlee103 View Post
      FYI: My previous post

      I replaced my dead post o2 sensor 4 days ago and it got rid of the CEL until it came back today.

      This is what I got this evening:

      17526 - Oxygen (Lambda) Sensor Heating; B1 S2: Open Circuit
      P1118 - 35-10 - - - Intermittent
      16518 - Oxygen (Lambda) Sensor B1 S1: No Activity
      P0134 - 35-10 - - - Intermittent

      I did Readiness testing and I found that the voltage for Post o2 was jumping up and down like crazy. Sometimes the reading would jump up to .7-.890v range then it all of sudden drops to < .1 then goes back up. (Later I found out that 2 sensors were randomly shutting on/off without me doing anything.)

      I am suspecting that it's the hardness or the wiring itself that is causing this problem. How do I make sure of this so that I don't make a mistake? I just bought the o2 sensor a few days ago so its unlikely that it's o2 sensor again but I would like to make sure.

      Thanks!
      Don
      Sounds like the ecu I jus replaced one in my 1.8t gli the boost was goin crazy and eventually it switched to ECM the codes just said O2 sensors I replaced my ecu and every things back to normal but remember if u get a used ecu get the security codes if not it's useless

    7. Junior Member
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      09-15-2010 03:06 PM #7
      Quote Originally Posted by Joshmccauley View Post
      Sounds like the ecu I jus replaced one in my 1.8t gli the boost was goin crazy and eventually it switched to ECM the codes just said O2 sensors I replaced my ecu and every things back to normal but remember if u get a used ecu get the security codes if not it's useless
      Can you elaborate a little more?

      My boost didn't jump back and forth until 3 days after I cleared the code. The car was fine for first 3 days and all of sudden the ecl came on. :S

      I hope it's not a big problem.

    8. Junior Member
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      09-15-2010 06:06 PM #8
      BUMP

    9. Junior Member
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      09-16-2010 12:53 AM #9
      Ok, I did a thorough auto-can after work and I got this...

      Chassis Type: 1J - VW Golf/Bora IV
      Scan: 01 02 03 08 15 16 17 19 22 29 35 36 37 39 46 47 55 56 57 75
      76

      Mileage: 190760km/118532miles
      -------------------------------------------------------------------------------
      Address 01: Engine Labels: 06A-906-032-AWD.lbl
      Part No: 06A 906 032 CL
      Component: 1.8l 5V 110kW TLG V004
      Coding: 06530
      Shop #: WSC 12856
      VCID: 6AD022343C17

      13 Faults Found:
      17832 - Secondary Air Injection System; Bank 1: Leak Detected
      P1424 - 35-10 - - - Intermittent
      17633 - Fuel Injector for Cylinder 1 (N30): Short to Ground
      P1225 - 35-10 - - - Intermittent
      17635 - Fuel Injector for Cylinder 3 (N32): Short to Ground
      P1227 - 35-10 - - - Intermittent
      17636 - Fuel Injector for Cylinder 4 (N33): Short to Ground
      P1228 - 35-10 - - - Intermittent
      17634 - Fuel Injector for Cylinder 2 (N31): Short to Ground
      P1226 - 35-10 - - - Intermittent
      17833 - EVAP Purge Valve (N80): Short to Ground
      P1425 - 35-10 - - - Intermittent
      17955 - Boost Pressure Regulation Valve (N75): Short to Ground
      P1547 - 35-10 - - - Intermittent
      17525 - Oxygen (Lambda) Sensor Heating Circuit: B1 S2: Short to Ground
      P1117 - 35-10 - - - Intermittent
      17843 - Secondary Air Pump Relay (J299): Short to Ground
      P1435 - 35-10 - - - Intermittent
      17829 - Secondary Air Injection Solenoid Valve (N112): Short to Ground
      P1421 - 35-10 - - - Intermittent
      17697 - Boost Pressure Control Valve (N249): Short to Ground
      P1289 - 35-10 - - - Intermittent
      17880 - EVAP Leak Detection Pump: Short to Ground
      P1472 - 35-10 - - - Intermittent
      17536 - Fuel Trim; Bank 1 (Mult): System too Lean
      P1128 - 35-10 - - - Intermittent
      Readiness: 0000 0000

      I looked online and it seems like Fuel Pump Relay is at fault? Does anybody know where this is located?

      Kind regards,
      Don

    10. Member swagger rob's Avatar
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      09-16-2010 09:22 AM #10
      in the relay panel above the driver's side footwell

    11. Junior Member
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      09-17-2010 01:47 AM #11
      Thanks for the comment.

      Update: I just put a brand new fuel pump relay in there and drove about 20kms without deleting fault codes. Car was definitely smoother but it still gave me a random boost. (5psi or 17psi) Came home, plugged Vagcom and saw same 13 fault codes so I deleted them all.

      I thought these intermittent codes disappear once the ecu picks up signal... no?

    12. Member swagger rob's Avatar
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      09-17-2010 07:26 AM #12
      No it takes a few starts

    13. 09-17-2010 01:01 PM #13
      Quote Originally Posted by GTINC View Post
      How did the operation of the car change after you changed the O2 sensors? O2 sensors rarely go bad-they are just the messenger for a problem upstream.
      Really? Because every car I've had, including my GTI, I've had an o2 sensor go bad on me.

    14. Senior Member .LSinLV.'s Avatar
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      09-17-2010 01:22 PM #14
      Quote Originally Posted by GTINC View Post
      How did the operation of the car change after you changed the O2 sensors? O2 sensors rarely go bad-they are just the messenger for a problem upstream.
      X2....you are not diagnosing the true issue (s) you are randomly replacing parts.

      you need to start at the begining and work methodically to the real issue.

      clear all the codes, drive the car until the readiness resests, and then see what you have (codes) again.

      from there we can walk step by step through an accurate diagnosis.

      Larry

      Demokratikally Elekted Minister of Shekels of the Independent People's Republik of Offtopikstan

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      09-18-2010 12:55 AM #15
      Hey guys, thanks very much for your support in this. I've got update to those who are interested.

      After deletion of codes yesterday evening, I took my car out to drive (~40kms one way) in the morning and I was getting good boost and everything seemed good and all. However, on the way back, the car was put on to a limp mode again and I was not able to achieve >5psi like I did before.

      Therefore I came home and plugged vag-com in once again and I've got this.

      1 Fault Found:
      17536 - Fuel Trim; Bank 1 (Mult): System too Lean
      P1128 - 35-00 - -
      Readiness: 0000 0000

      Now, I am not too sure if there are more to come as I only drove 80kms total after the codes were cleared. Anyhow, I did look into this issue with more attention and I found this fellow guy from vwvortex who posted very informative info about testing in general: http://forums.vwvortex.com/showthread.php?1265064

      I have done the test as instructed and everything seemed to go ok except these 3 tests:

      Block 030 - Oxygen Sensor Regulation
      Block 034 - Aging of Pre-Cat Oxygen Sensor

      for block 030, I was not able to achieve suggested value for post-cat o2 sensor and mainly it changed from 000 to 100 (000 pretty much dominated the chance though)

      for block 034, the age of pre-cat sensor showed .80 which is a bare minimum even after I've changed it. Furthermore, I was not able to get my car in to "Test-ON" mode for pre-cat so I was not able to check if it was bad.

      Just to recap what I have done to resolve this matter, I have replaced o2 sensors a week ago and changed fuel pump relay to get rid of "short to ground" madness. MAF seems to be perfectly fine when tested and it was also replaced not too long ago.

      I did read some posts about how people changed their ECUs and their problem cleared up because it was faulty and threw random CELs even though everything was working in adequate condition. Does anyone see a possibility for my problem as well?

      Thanks again,
      Don

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      09-18-2010 03:11 PM #16
      Bumping it up. Hopefully someone has an idea before it gets in to the mechanics hand.

    17. Junior Member
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      09-19-2010 12:03 AM #17
      BUMP

    18. 04-12-2013 11:48 AM #18
      I had my car 1.8T aww scanned today and it said I have a faulty o2sensor. As far as I know it's the front sensor. The car is lagging and seems to run choppy. Turbo is fine and I'm getting boost. Would this o2sensor issue make you loose some power??

      Thanks in advance

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