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Fault code help.

Discussion in 'A3/S3 Forum (8L Chassis)' started by ayfreetee, May 18, 2012.

  1. ayfreetee
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    ayfreetee Active Member

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    [May 18, 2012]
    On my way to work this morning my mil light came on, when I checked it with my code reader it said, PO172 system over rich bank one, does anyone have any idea what it means and what the cause could be, I cleared the code, then went for a blast and all is well, thanks for any help.
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  2. s33nyboy12
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    s33nyboy12 Well-Known Member

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    [May 18, 2012]
    I had this, my mate come out with vag com asked me where I'd bin, told him work then petrol station, he cleared code went to my fuel cap tighten it a click then said there sorted and light not bin back n since, this was 2 weeks ago.
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  3. ayfreetee
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    ayfreetee Active Member

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    [May 18, 2012]
    Thanks for that, funny enough, I got petrol the night before, I just went out and tightened my cap a few clicks too, just have to wait and see what happens now, cheers.
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  4. <tuffty/>
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    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator

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    [May 18, 2012]
    16556/P0172/000370 - Ross-Tech Wiki

    16556/P0172 - System Too Rich, Bank 1
    Possible Symptoms

    Irregular behaviour

    Possible Causes

    Fuel system
    Excessive fuel pressure
    Leaking or contaminated fuel injectors
    Leaking fuel pressure regulator
    Low fuel pressure or running out of fuel
    Vapor recovery system
    Air leaks after the MAF
    Vacuum leaks
    Improper seated engine oil dipstick
    Stuck EGR valve
    Oil overfill
    Cam timing
    Cylinder compression
    Exhaust leaks before or near HO2Ss.

    Seen this before on BAM engined S3's... what year is your car?

    In the cases I have seen the rubber fuel hoses rot and the 'stuff' collects in the FPR giving increased fuel pressure and thus the too rich fault code...


    Looks like this...
    [​IMG]

    <tuffty/>
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  5. ayfreetee
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    ayfreetee Active Member

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    [May 18, 2012]
    Wow now that's a big list thanks, the car is an A3T 2001 with AUM.
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  6. ayfreetee
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    ayfreetee Active Member

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    [May 20, 2012]
    Quick update, I did 360 miles since I wiped the code from the ecu and still no probs, thanks for info chaps :)
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