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  1. #1
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    Audi A4 Avant 1.8T Fault code help

    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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  3. #2
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    bump anyone got any ideas

  4. #3
    simon.m's Avatar
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    not sure if you have this but its where to find the codes meanings hope it helps
    http://wiki.ross-tech.com/wiki/index.php/Main_Page

  5. #4
    6th Gear

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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/s...ad.php?t=74455

 

 

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