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    Thread: O2 Sensor B1S1 - Internal Resistance too High, Intermittent, Is 02 Sensor Bad?

    1. Member Currancchs's Avatar
      Join Date
      Feb 24th, 2011
      Location
      Nashua, NH
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      373
      Vehicles
      2001 Audi TT 225Q; 1998 VW Cabrio (Sold)
      03-06-2011 04:35 PM #1
      Car is an '01 Audi TT, I have been experiencing an intermittent rough idle, with very occasional "Popping" sound from the exhaust... The car is also only putting out about 10 psi of boost, and the ECU is calling for roughly 15 psi... Not sure if the issues are related.

      Readings taken during a quick drive after the car warmed up this afternoon showed the front 02 sensor resistance ~0.6-0.7 KOhms, and the post cat was 0.1-0.3 KOhms (No related trouble code). Voltages for the pre-cat were sporadic, from 0.125-0.895v.

      Also of note, the internal resistance measurement for the pre cat sensor stopped displaying about 5 minutes into the ride, does this signify a fault, or may the heater have just turned off?

      Lastly, when the car is shut off when idling roughly it has (Twice in 4 months) dieseled, or continued to run roughly with key off for ~4-10 seconds... Again, not sure if related, any insight is appreciated. Thanks!

      ----
      SOLVED

      The problem was a combination of bad primary O2 and a massive vacuum/boost leak coming from the brake booster line as it runs under the front portion of the intake manifold, blew as soon as pressurized (and no, it was not over pressurized) lean fuel trim caused check engine light 5 minutes before pressure test!
      Last edited by Currancchs; 03-29-2011 at 04:34 PM. Reason: Solved

    2. Forum Sponsor Dana @ Ross-Tech's Avatar
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      Sep 15th, 2009
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      Apollo, PA
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      02 Gti, 12 Tiggy SEL
      03-06-2011 09:54 PM #2
      Please post the Auto-Scan from this vehicle and the info from measuring block 032 as described here: Fuel Trim Info
      Dana Marie

      P.S. No Scan = No Soup

    3. Member Currancchs's Avatar
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      2001 Audi TT 225Q; 1998 VW Cabrio (Sold)
      03-07-2011 08:13 AM #3
      Thanks for your quick response, My Block 032 measurements are 4.3% @ Idle and 6.3% @ Part Throttle. The Auto Scan Results are below.

      VCDS Version: Release 10.6.3 (x64)
      Data version: 20101206

      Monday,07,March,2011,07:59:44:51317

      Chassis Type: 8N - Audi TT
      Scan: 01 02 03 08 15 17 22 35 37 45 55 56 76 77

      -------------------------------------------------------------------------------
      Address 01: Engine Labels: 06A-906-032-AMU.lbl
      Part No: 8N0 906 018 T
      Component: 1.8L R4/5VT G 0003
      Coding: 06710
      Shop #: WSC 01236
      VCID: 428587D06409

      1 Fault Found:
      17521 - Oxygen (Lambda) Sensor; B1 S1: Internal Resistance too High
      P1113 - 35-10 - - - Intermittent
      Readiness: 0000 1000

      -------------------------------------------------------------------------------
      Address 03: ABS Brakes Labels: 8N0-907-379-MK20-E.lbl
      Part No: 8N0 907 379 E
      Component: ESP 20 CAN V004
      Coding: 18446
      Shop #: WSC 01236
      VCID: 3E7DF32010F1

      No fault code found.

      -------------------------------------------------------------------------------
      Address 08: Auto HVAC Labels: None
      Part No: 8N0 820 043 A
      Component: TT-KLIMAVOLLAUTOMAT D03
      Coding: 00140
      Shop #: WSC 01236
      VCID: 28513578E275

      1 Fault Found:
      00604 - Potentiometer Positioning Motor for Air Flow Flap (G113)
      30-10 - Open or Short to Plus - Intermittent

      -------------------------------------------------------------------------------
      Address 15: Airbags Labels: 8N8-909-601.lbl
      Part No: 8N8 909 601
      Component: Airbag Front+Seite 1005
      Coding: 10102
      Shop #: WSC 01236
      VCID: F7F3A604FF4B

      No fault code found.

      -------------------------------------------------------------------------------
      Address 17: Instruments Labels: 8Nx-920-xxx-17.lbl
      Part No: 8N1 920 930 E
      Component: KOMBI+WEGFAHRS. M73 D08
      Coding: 02244
      Shop #: WSC 00000
      VCID: 336BD2142BB3

      No Faults Found
      or DTCs not supported by controller
      or a communication error occurred

      -------------------------------------------------------------------------------
      Address 22: AWD Labels: 02D-900-554.lbl
      Part No: 02D 900 554 B
      Component: HALDEX LSC ECC 0006
      VCID: 1F432EA4B73B

      No fault code found.

      -------------------------------------------------------------------------------
      Address 35: Centr. Locks Labels: 8Nx-962-267.lbl
      Part No: 8N7 962 267 A
      Component: Central Lock/Alarm D05
      Coding: 15900
      Shop #: WSC 00000
      VCID: 3E7DF32010F1

      1 Fault Found:
      01370 - Alarm triggered by Interior Monitoring
      35-00 - -

      -------------------------------------------------------------------------------
      Address 45: Inter. Monitor Labels: 8E0-951-177.lbl
      Part No: 8N7 951 177
      Component: Innenraumueberw. D14
      Coding: 00001
      Shop #: WSC 00000
      VCID: FBFBBA34C363

      No fault code found.

      -------------------------------------------------------------------------------
      Address 55: Xenon Range Labels: 4B0-907-357-AUT.lbl
      Part No: 4B0 907 357
      Component: LEUCHTWEITEREGLER D004
      Coding: 00010
      Shop #: WSC 01236
      VCID: E5CFFC4C55E7

      No fault code found.

      -------------------------------------------------------------------------------
      Address 56: Radio Labels: 8D0-035-1xx-56.lbl
      Part No: 8N0 035 186 A
      Component: Radio D05
      Coding: 00017
      Shop #: WSC 01236
      VCID: 2E5DC360C091

      No fault code found.
      End ---------------------------------------------------------------------

    4. Member
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      Feb 25th, 2010
      Location
      Wilkes-Barre, PA
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      270
      03-07-2011 11:16 AM #4
      Usually if the O2 wiring is good I replace the sensor for this code. Good Luck

    5. Member Currancchs's Avatar
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      Feb 24th, 2011
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      Nashua, NH
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      2001 Audi TT 225Q; 1998 VW Cabrio (Sold)
      03-14-2011 08:12 AM #5
      I got the O2 sensor today, will install this weekend and let you know if it clears things up. Interestingly I replaced my N75 this past weekend and went from getting ~10.5 psi to about 13.0 psi and ~170 HP to ~205 according to Vag-com, so making my way towards getting her to run correctly at least

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