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  1. #1
    RedZed2009 Guest

    Audi 1.8T Fuel Trim: Bank 1 (Mult): System too Lean

    Hi All.

    this fault has just come up today, any suggestions as to the likely fault? Many thanks in advance

    Address 01: Engine
    Controller: 06A 906 032 FC
    Component: 1.8L R4/5VT 0001
    Coding: 11500
    Shop #: WSC 06435
    WAUZZZ8Lxxxxxxx AUZ5Z0YNxxxxxxxxx
    1 Fault Found:
    17536 - Fuel Trim: Bank 1 (Mult): System too Lean
    P1128 - 35-00 - -
    Readiness: 0000 0000

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    Re: Audi 1.8T Fuel Trim: Bank 1 (Mult): System too Lean

    Taken from the Ross-Tech Wiki

    17536/P1128/004392 - Fuel Trim; Bank 1 (Mult): System too Lean
    Possible Symptoms
    Malfunction Indicator Light (MIL) active
    Possible Causes
    Mass Air Flow (MAF) Sensor faulty
    Oxygen Sensor Control faulty
    Oxygen Sensor(s) faulty
    Fuel Injector(s) faulty
    Possible Solutions
    Check Mass Air Flow (MAF) Sensor
    Check Oxygen Sensor Control
    Check Oxygen Sensor(s)
    Check Fuel Injector(s)
    A4 2.5 tdi QS (mapped)



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    Re: Audi 1.8T Fuel Trim: Bank 1 (Mult): System too Lean

    hi check this out
    http://wiki.ross-tech.com/index.php/17536/P1128/004392

    could also be a air leak on the inlet manifold, intake pipe after the air flow sensor any of the intercooler pipes and small vacuum pipes, also exhaust leak b4 the first lambda sensor
    hth paul

  4. #4
    RedZed2009 Guest

    Re: Audi 1.8T Fuel Trim: Bank 1 (Mult): System too Lean

    Many thanks for the fast response guys. The car has only just come back from being serviced so I was not too happy about the engine light coming on. The exhaust bracket had also broken so this was welded up at the time. The A3 is my wife's car and we have had it from new (2001), it only has only covered about 36,000 miles.

    Looking under the bonnet I have found the following pipe that was not reconnected after airfilter change in the service.... any ideas what this pipe feeds and could this have caused the fault? A long shot, but it would be nice if it was that simple.

    Also, does anyone have a electronic copy of the service manual ?


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    Re: Audi 1.8T Fuel Trim: Bank 1 (Mult): System too Lean

    secondary air pipe for reducing emissions at low engine temperature by inducing air into the intake via a electric pump.This will affect lambda readings and as your vehicle uses the broadband type it may take some time to confirm if the fault code is erased as this fault code is based on fuel trim readings which are calculated by the lambda probe compensating air to fuel ratio and once the parameters are exceeded the ecu will illuminate the mil light and a fault code will store.In short refit the pipe and clear the fault code if the fault reoccurs post measured value blocks 32 and don't clear the code as you will lose important information for short term and long term fuel trim

  6. #6
    RedZed2009 Guest

    Re: Audi 1.8T Fuel Trim: Bank 1 (Mult): System too Lean

    many thanks.. I reconnected the pipe, then reset the fault code and went for a 30 mile drive. When I first drove off the car was hesitant to pick up but after 0.5 miles it went smooth again. I took the down the motorway at various speed also 100mph for a while and all seems fine again. Then back on the slower roads and car seem fine.

    If the code comes up again I will post mearured blocks 32 as you suggest. I will have to figure out how to do this

    A big thank you to all for the help so far. A great site.

  7. #7
    RedZed2009 Guest

    Re: Audi 1.8T Fuel Trim: Bank 1 (Mult): System too Lean

    The problem was the Mass Air Flow sensor.... car is running perfectly again. Many thanks for the assistance

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    Re: Audi 1.8T Fuel Trim: Bank 1 (Mult): System too Lean

    Quote Originally Posted by RedZed2009 View Post
    The problem was the Mass Air Flow sensor.... car is running perfectly again. Many thanks for the assistance
    My 2.0 bug has the same code unless I take it easy on the throttle while toddling about.

    How did you confirm the MAF ?

    I'll gladly change mine as it's about 40+ cheaper than a pre cat sensor change

    Regards, Ian
    Royal Air Force Aeromechanical Engineer

    New Beetle 2.0 2001 72k in Pistachio

  9. #9
    RedZed2009 Guest

    Re: Audi 1.8T Fuel Trim: Bank 1 (Mult): System too Lean

    I took it to a service centre, who confirmed the MAF.

    Bit of a waste on the diagnostics, but at least it confirmed the issue.

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    Re: Audi 1.8T Fuel Trim: Bank 1 (Mult): System too Lean

    Quote Originally Posted by RedZed2009 View Post
    I took it to a service centre, who confirmed the MAF.

    Bit of a waste on the diagnostics, but at least it confirmed the issue.
    disconect your maf then drive it for a while if it run the same possible maf fault

 

 
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