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Thread: Check engine light on - codes 174, 175 & 178

  1. #1
    Sport Button On
    Join Date
    Dec 2008
    Posts
    48

    Check engine light on - codes 174, 175 & 178

    My check engine light came on. Scan tool came up with:

    174 - AE fuel system diagnosis - Bank 1
    175 - AE fuel system diagnosis - Bank 2
    178 - Cat conversion - Bank 1

    I do have an aftermarket eisenmann exhaust. Car has 14K miles. 5K since exhaust installed

    Anyone have any idea what may be of issue?

  2. #2
    Team Z8 zed8's Avatar
    Join Date
    Aug 2003
    Posts
    303
    174 and 175 might be MAF sensors and 178 O2 sensor.
    Hattat

    AF77768 Topasblau / Schwarz

    PP installed
    Motorsport 20" style 101 wheels
    Eisenmann catback
    Supersprint headers
    CDV removed
    Quaife LSD
    3.64 gearing

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