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Audi A4 Avant 1.8T Fault code help

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by Wilo, May 7, 2010.

  1. Wilo
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    Wilo Member

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    Hi All

    Last week my engine management warning light came on and the car started to cut out sometimes when left to idle (like you has stalled it) i managed to borrow a VAG diagnostic tool and it came up with the below faults,
    "boost pressure regulation valve (N75) open circuit P1548"
    and
    "fuel trim bank 1(multi) system too lean P1128 - sporadic 001-Upper"

    Can any explain these fault to me if possible?

    I cleared them on the VAG tool and now the car is running fine ?

    Any ideas?

    Thanks
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  2. Wilo
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    Wilo Member

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    bump anyone got any ideas
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  3. simon.m
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    simon.m Active Member

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  4. B5NUT
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    B5NUT Active Member

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    On the older B5 the wiring to the N75 valve used to break and cause the open circuit fault, the other option is it could just be a fault valve.

    Sorry cannot help with the second fault, did a qcick google on the fault and found this http://www.vwaudiforum.co.uk/forum/showthread.php?t=74455
    #4

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