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Too rich and too lean! Ahhhhh

bowen Nov 21, 2011

  1. bowen

    bowen Member

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    Hi guys,

    Recently had some running problems with my a4 b6 cab, BFB engine code. I was getting 3 codes; running rich,running lean and high rpm at idle. With a bit of research it led me to the crankcase breather valve. I replaced this and a good job I did as the old one was shafted. Now I have replace it with a genuine part I have just got CEL 17545 and 17536 running rich and lean?! How!? It had a new maf around a month ago.

    Any help would be great, thanks.
     
  2. marktdisport

    marktdisport Active Member

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    would a lambda sensor cause your faults bowen ... just a guess !!!!
     
  3. bowen

    bowen Member

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    I've looked at Ross tech, it does suggest lambda sensor, maf or vac/boost leak? Im getting it smoke tested next week, that should eliminate the leak, hopefully.
     
  4. quattro tony

    quattro tony Member

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    I would be looking at all the rubber hoses around the throttle valve carefully for any splits, deterioration, holes etc..... Especially between the air mass meter and the throttle valve. An air leak could cause a high idle and mixture trim faults.
     
  5. bowen

    bowen Member

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    i hope the smoke test shows up an air leak!

    will let you know.
     
  6. bowen

    bowen Member

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    Does any one have an etka for the diverter valve location?
     
  7. olly quattro

    olly quattro Member

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    diverter valve is down the bottom of the engine bay accessed from under the car, Number 14

    [​IMG]
     
    bowen likes this.
  8. bowen

    bowen Member

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    found it, cheers mate!
     
  9. bowen

    bowen Member

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    Ok, so i had no leaks from the smoke test. I still get 17545 and 17536.

    Also to note, my temp gauge works intermittently? would this cause these codes, it has had a new temp sensor last mont though?
     
  10. quattrojames

    quattrojames Moderator Staff Member Moderator Audi A6 Audi Avant Owner Group

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    What *exactly* does the Ross-Tech wiki list those codes as?
     
  11. bowen

    bowen Member

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    [h=2]17545/P1137/004407 - Fuel Trim: Bank 1 (Add): System too Rich[/h][h=4]Possible Symptoms[/h]
    • Malfunction Indicator Light (MIL) active
    [h=4]Possible Causes[/h]
    • Mass Air Flow (MAF) Sensor faulty
    • Fuel Pressure Regulator faulty
    • Fuel Injector(s) faulty
    • Oxygen Sensor Control faulty
      • Oxygen Sensor(s) faulty
    • Evaporative Emission (EVAP) System faulty
    [h=4]Possible Solutions[/h]
    • Check Mass Air Flow (MAF) Sensor
    • Check Fuel Pressure Regulator
    • Check Fuel Injector(s)
    • Check Oxygen Sensor Control
      • Check Oxygen Sensor(s)
    • Check Evaporative Emission (EVAP) System
     
  12. bowen

    bowen Member

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    [h=2]17536/P1128/004392 - Fuel Trim; Bank 1 (Mult): System too Lean[/h][h=4]Possible Symptoms[/h]
    • Malfunction Indicator Light (MIL) active
    [h=4]Possible Causes[/h]
    • Mass Air Flow (MAF) Sensor faulty
    • Oxygen Sensor Control faulty
      • Oxygen Sensor(s) faulty
    • Fuel Injector(s) faulty
    [h=4]Possible Solutions[/h]
    • Check Mass Air Flow (MAF) Sensor
    • Check Oxygen Sensor Control
      • Check Oxygen Sensor(s)
    • Check Fuel Injector(s)
     
  13. bowen

    bowen Member

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    My next point of call is Lambda sensor/s
     
  14. InFlames

    InFlames New Member

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    Hi! I have almost the same problem :(
    My car is a A4 2.0 liter engine, ALT sedan 2001
    There is two recurring error in Engine. I also linked what suggest ross-tech wiki

    16804/P0420/001056 - Catalyst System; Bank 1: Efficiency Below Threshold

    Possible Causes
    • Leakage in Intake and/or Exhaust System
    • Catalyst faulty
    • Oxygen Sensor(s) faulty
    • Oxygen Sensor(s) Control faulty
    Possible Solutions
    • Check Intake and Exhaust System for Leaks
    • Check Catalyst
    • Check Oxygen Sensor(s)
    • Check Oxygen Sensor(s) Control
      • Perform Oxygen Sensor(s) Aging Check

    17544/P1136/004406 - Fuel Trim: Bank 1 (Add): System too Lean


    Possible Solutions
    • Check Mass Air Flow (MAF) Sensor
    • Check Fuel Pressure Regulator
    • Check Fuel Pump
    • Check Intake/Exhaust System for Leaks
    • Check Secondary Air Injection for Leaks
    • Check Vacuum Lines for Leaks
    I have checked both O2 (lambda) sensor's heater resistance.
    View attachment 10383 View attachment 10384


    G130 (4 pin connector) lambda probe's resistance between 2 and 1 pin was 8 Ohm around ~ 5°C I think this is OK
    G39 (6 pin connector) lambda probe's resistance between 4 and 3 pin was 2,7 Ohm around ~ 5°C Is this resitance OK?
    G39 had a cap, I took off and take measured. I find it is the 6 and 2 pin was 107,9 Ohm around ~ 5°C

    View attachment 10387

    Measuring Block 006 field 4 Lambda was -3,1%

    Last week was -4,7%

    View attachment 10386

    I also find a manual. O2_Sensor_Testng_DIY V2.pdf
    View attachment 10380

    In field 2 I had a readout of ~1,5 V, wich is out of spec 0 V - 1 V. What is wrong?
    View attachment 10381
    View attachment 10382

    That's it until now.
    Any thoughts?
     

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