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ABS and ESP lights - Brake pressure sensor fault - Help!

Discussion in 'A6/S6/Allroad forum (C5 Chassis)' started by wilkoa6, Jan 9, 2009.

  1. wilkoa6
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    wilkoa6 New Member

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    [Jan 9, 2009]
    I am grateful for all the practical help and advice on here!
    I recently had ABS, ESP and flashing glow plug lights with no brake lights. This was cured by fitting a new brake light switch. Since then I have an intermittent problem with the ABS and ESP lights coming on when I brake and remaining on until the car is turned off and on.

    I took the car (2003 A6 Avant 1.9 Tdi) to local specialists today. The VAG reader came up with
    Brake Pressure Sensor 1 G201 01435

    They suggested this could be a new ABS control unit at over £1000. I'm hoping it could be something simpler. Could it be connected to the new brake switch? Is this worth changing?
    Any suggestions will be gratefully received!
    #1
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  3. wilkoa6
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    wilkoa6 New Member

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    [Jan 24, 2009]
    I think I may have cracked it! I reinstalled the brake light switch following the excellent instructions posted on
    http://forums.vwvortex.com/zerothread?id=1158315
    Since then I have had no ABS or ESP lights.
    I think the problem was that the switch was installed so that it took quite a movement of the brake pedal before the rear brake lights came on. Thus the ABS controller was detecting pressure before it got the signal from the brake switch. I have now got the brake lights coming on with the slightest brake pedal movement.

    I hope this is useful!
    #2
  4. vrbob
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    vrbob Thats no Moon, Thats a space station!

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    [Mar 24, 2010]
    That helped me alot so thanks for the info as this happened to me this morning when i went to go to work. Quick trip to audi for a new switch followed the guide as per the link and hey presto car is all good again.

    Just to say the brake switch i got from Audi today is a revised model so it looked completly different but hopefully works better than the last version.

    Also the link to the vwvotex website is very useful as i manged to fit the switch without breaking it as it seems like it might be a little tricky othewise.
    Last edited: Mar 24, 2010
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  5. wilkoa6
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    wilkoa6 New Member

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    [Mar 25, 2010]
    I am very pleased you found this useful! The knowledge on here has been very valuable to me.
    #4

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