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  1. #1
    Established Member Two Rings
    Join Date
    Oct 23 2011
    AZ Member #
    82917
    Location
    Washington DC

    Replaced ABS Module and wheel speed sensor - but still lots of warning lights on dash

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    Hello everyone!
    I recently bought a 2004 Audi S4 6-speed manual, premium plus. It’s a great car, except when buying it I knew there would be a few issues. The biggest one by far is the issues I’ve been having with the wheel speed sensors.

    I got all the signs that the ABS Module was bad and possibly the front left ABS/wheel speed sensor. So, I replaced both of these. I used a genuine VW/Audi ABS module that I ordered from ECS Tuning. I got a cheap after-market ABS Sensor. ABS Module: https://www.ecstuning.com/Audi-B6_S4...dule/ES447390/ (got it on sale last week for $300, nice!). And the sensor: https://www.ecstuning.com/Audi-B6_S4...cal/ES2807155/

    So I replaced both of these following these instructions for the ABS Module: https://www.youtube.com/watch?v=tID9NUBBkLY

    I replaced everything, followed the steps using the Ross-Tech VAG-COM to do the coding, and I still have all the lights on the dashboard on. The Anti-roll, ABS, Brake, and Brake pad sensor are all on! Crazy! I can’t figure out why. I re-coded it twice, with no luck. My only theory is that the ABS Sensor I bought is a cheap-o, shitty sensor. But I can’t be certain.

    Before I replaced everything, the speedo was broken, the car lurched when shifting gears, and the warnings lights would come on intermittently. These problems are all gone and everything works mechanically, except for all the lights on the dash and I presume no ABS.
    Thoughts?

    TL;DR– Replaced ABS Module with VW/Audi part and front left wheel speed sensor with cheap one. Re-coded ABS Module to car. ABS/Brake/Brake Pad/ESC lights are all on. But speedo works and everything else mechanically.

  2. #2
    Veteran Member Three Rings
    Join Date
    Jul 28 2008
    AZ Member #
    31374
    Location
    Everywhere

    What are the codes?

  3. #3
    Established Member Two Rings
    Join Date
    Oct 23 2011
    AZ Member #
    82917
    Location
    Washington DC

    Right now I am only getting a 00274 code that says an issue about the rear right sensor. I will re-scan tomorrow and post the exact codes. I've cleared this code and it comes right back on.

  4. #4
    Veteran Member Four Rings xhackerekx's Avatar
    Join Date
    Jul 23 2007
    AZ Member #
    19741
    My Garage
    10S6C6_12Q7TDI_A4B6 3.0_VNL730
    Location
    Scranton , PA / Poland UE

    when one sensor is fail still u have Christmas tree on dash change sensor and try again.

  5. #5
    Active Member Two Rings
    Join Date
    Dec 10 2011
    AZ Member #
    85079
    My Garage
    05 s4, 67 chevelle
    Location
    Casper, Wy

    I have a similar problem but the mechanic said it was the rear sensor. I haven't been able to find any post where people have solved the problem. I paid around 300 to have the sensor replaced with no luck and I don't want to keep throwing money at this problem while crossing fingers.

  6. #6
    Veteran Member Four Rings JimmyBones's Avatar
    Join Date
    Apr 03 2010
    AZ Member #
    57098
    Location
    Northern Virginia

    Make sure that the sensor wheel on the outer CV joint is good.

  7. #7
    Active Member One Ring DukeNukem's Avatar
    Join Date
    Mar 23 2013
    AZ Member #
    111874
    Location
    Keller, Tx

    Did you ever find out what the problem was? I just had my ABS module repaired and the sensors were recently replaced as well but I still have all of the mentioned dash lights on.
    '04 Brilliant Black 6 spd

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