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  1. #1
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    17536 - Fuel Trim Bank 1 (Mult): System too Lean

    Hey Guys,

    I have read quite a bit into this and know it could be one of many things...MAF Sensor, O2 Sensors or Vacuum Pipes. A little background:

    I diverted the pipework past the N249 valve the other night because the car had started to become a little slugish, it had perked up slightly however a couple of day later I get the following error code (17536 - Fuel Trim Bank 1 (Mult): System too Lean).



    I had a little inspection tonight (couldn't sleep!!!) and found a worn pipe, however it's connected to an item on the fuel rail (drawn around it in red in the image attached - i think it's a fuel pressure regulator?). The pipe was quite a little loose, could this be causing the fault code?

    Are there any other tests I could perform? Your help is really appreciated as I'm driving to Loughborough this weekend!!!

    Cheers

    cagiti

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  3. #2
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    I'd replace the hose (can't see the pic at work as they block image sites), clear the code and go from there. If its the hose for the FPR then it'll effect fueling for sure if it's perished. Mine looked very worn so I replaced it with 4mm silicon hose recently.
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  4. #3
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    Yes thats the FPR replace the pipe...

  5. #4
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    Sounds about right, under boost you will be loosing pressure from there.

    The FPR is reliant on boost pressure to know how much pressure to use, as the the system is 3 BAR plus boost pressure.
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  6. #5
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    Cheers guys, going to get me some hose and clips tonight and bring an end to this nightmare!!!!

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    Well I fitted the new pipe, it was a nightmare to get it on at the inlet manifold side!! Anyway managed to do it, then tried starting it and it sounded like a bag of spanners!! Initial thoughts were "oh sh*t", so I had a little look under the bonnet and a pipe had come off!! So I started it and all was well, went for a spin and it's like new!!

    Cheers for the help guys!! V happy

  8. #7
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    when you reset the faultcode, it clears the adaptions...
    if you have vagcom, just check what block 032 does periodically to see if its adding % over time... When it hits 25% it stick the dash light on with the faultcode..

    hoping you have fixed it tho.
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    Quote Originally Posted by badger5 View Post
    when you reset the faultcode, it clears the adaptions...
    if you have vagcom, just check what block 032 does periodically to see if its adding % over time... When it hits 25% it stick the dash light on with the faultcode..

    hoping you have fixed it tho.
    Cheers badger5,

    I took it out for a spin before removing the fault code and it was boosting like it should. I then reset the fault code, haven't driven it since though! Are you saying that it should run better again post fault code clearing???

    Thank you again

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    Took it for a spin last night (first time since resetting the fault code), it was a bit lumpy to begin with with a few flat spots, but it improved and is boosting well now. Seems ok?!

  11. #10
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    Has anyone removed the inlet manifold to fix the pressure pipes underneath as it is incredibly awkward to get to otherwise?

  12. #11
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    Although you'd expect the FPR to be directly related to the lean fuel trim fault code i would say unplug the MAF to see if the car feels any better. I suspect a dodgy MAF
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    Well after a busy couple of months and what not I have swapped the pipe to the FPR, changed the N75 and unplugged the MAF sensor (which made the car run like a dog!) in a view to solving this 'fuel trim bank 1' issue described earlier in this thread!

    After I swapped the N75 a fortnight ago I thought it may have been cured! Then the dreaded engine light came on and it's been even slower!! I didn't think it was boosting right, but it definitely felt quicker after fitting the N75 and resetting the fault code!

    Now the car shows the engine warning light intermittently, any takers?

  14. #13
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    Fault codes?

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    The fault code is 17536 - fuel trim bank error! I think another pipe may have perished, what dyou think?

  16. #15
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    Quote Originally Posted by cagiti View Post
    The fault code is 17536 - fuel trim bank error! I think another pipe may have perished, what dyou think?
    17536/P1128/004392 - Ross-Tech Wiki

    Sounds like you have a vacuum leak... one big enough to throw that code is normally to do with the PCV pipes under the inlet manifold...

    <tuffty/>
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    Cheers tuffty, btw is it difficult to get to these PCV pipes? Would I need to take the inlet manifold off? If so would I need to replace gaskets etc?

    Btw, what line of work are you in?

  18. #17
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    Quote Originally Posted by cagiti View Post
    Cheers tuffty, btw is it difficult to get to these PCV pipes? Would I need to take the inlet manifold off? If so would I need to replace gaskets etc?
    You can get to the pipes easier by removing the bracket in front of the inlet mani... remove the plastic trim panel (two screws).. the bracket unbolts from the mai with two 5mm allen bolts... unplug the EGT sensor box wiring (if you have an AMK/BAM engine code) and carefully unhook the bracket from the dipstick tube... be very careful with this as they normally break due to going hard over the years... if in doubt buy a new one from a dealer prier to doing this... less than a fiver iirc...

    All the pipes are underneath...

    There is a guide for simplifying the PCV here...
    Guide - How to fit a catch can and simplify the PCV system

    ...and an underside shot of the oulets of the S3 mani... pipes connected to the centre one are the ones that tend to go..


    Quote Originally Posted by cagiti View Post
    Btw, what line of work are you in?
    I work as a Business Intelligence Developer

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  19. #18
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    Thank you for the help tuffty, very chuffed! Will give it a crack when I get 5 minutes! I have a spare N75 as initially I thought it could be that, will give it a whirl next weekend me thinks!

    Thought you were in that line of work, I'm in a similar field myself!

    Thank you again!

 

 

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