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  1. #1
    Active Member Two Rings C H A I N S A W's Avatar
    Join Date
    Apr 06 2016
    AZ Member #
    371397
    My Garage
    2000 A6 2.7t, '99 Mustang GT
    Location
    Indiana

    2.7t Misc. Parts

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    Had some random items break while working over the weekend.

    Here's what I'm after:

    Drivers Side Upper Timing Cover
    PN# 078 109 123 AJ

    T-Joint from upper radiator hose
    Will buy whole assembly if needed
    PN# 4B0121101P

    Clean Expansion Tank
    PN# 8D0121403M

    Located in 46732
    Any help would be appreciated!
    Last edited by C H A I N S A W; 08-08-2016 at 08:57 AM.
    -Ken

  2. #2
    Junior Member Two Rings
    Join Date
    Oct 18 2018
    AZ Member #
    429169
    My Garage
    A6 4B C5 Avant Quattro 2.7t Tip
    Location
    Shopshire, UK

    4B0121101P to N90765301 £200 to £2.89

    Massively late, but i was on thehunt for 4B0121101P as the seal had gone where it clips to engine side.
    Aftermarket clip ends avaiable from couple of companies in UK, or two divisions of same firm: 'Borg and Beck' & 'Firstline'
    Found a list of usefull ends with codes BTS for borg, and FTS for Firstline:
    BTS1117 (Radiator drain end)
    BTS1048 (Straight end)
    BTS1111( 45deg angle) THE ONE I WANTED!!!
    BTS 1121 (90 deg angle)

    After using their cross refernce VAG codes to check with oemepc..... found the seal I needed. I didn't need the whole connector!

    So: 4B0121101P RRP £200 ouch
    turned into
    N90765301 a 32 x 4 mm o-ring (Febi 29752) Two for £2.89!
    Result.

    Hope this helps others.

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