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Abs/ psm light on all the time

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Gavinhousley1961
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Gavinhousley1961 PCGB Member
2019/05/24 16:31:08 (permalink)

Abs/ psm light on all the time

Hello 
I have a 2001 facelift Carrera 4 and I'm having problems with th psm and abs light on all the time. I changed front wheel bearing removing the complete hub assembly then when reassembled lights cam straight on. The things I've done. Plugged in Porsche scanning tool and code 4025 front left wheel speed sensor wire. New speed sensor lloghts still on. Repaired wire harness lights still on. Any advice would be really helpful. Thank you. Gavin. 

5 Replies Related Threads

    C2dweller
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    C2dweller PCGB Member
    Re: Abs/ psm light on all the time 2019/05/25 08:06:38 (permalink)
    If you are confident the wiring is good and that you have the correct part fitted (they change during the manufacture period).
     
    It’s a long shot, but make sure that a simple steering angle calibration won’t fix it (I’ve seen this before).  You’ll need a diagnostic tool to perform this.

    Porsche Fanatic
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    TheOriginal996
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    TheOriginal996 PCGB Member
    Re: Abs/ psm light on all the time 2019/05/25 08:30:11 (permalink)
    I had this issue, and fixed it by replacing the Mass air sensor.
    Richard_Hamilton
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    Richard_Hamilton PCGB Member
    Re: Abs/ psm light on all the time 2019/05/25 09:29:54 (permalink)
    If the light came on immediately after changing the sensor, it sounds like there is still something iffy with the connection, or it is the wrong, or faulty sensor.  As Mark says, a failing MAF can cause the light to come on, but the brake pedal switch is another common culprit.

    (BTW, Welcome Mark!) 

    Richard
    1989 3.2 Carrera Sport in Guards Red/Linen & Audi RSQ3
    Previous:
    2012 Cayman 2.9 PDK, 2006 Cayman S, 2000 996 Turbo, 1998 996 C2, 1994 993 C2
    Gavinhousley1961
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    Gavinhousley1961 PCGB Member
    Re: Abs/ psm light on all the time 2019/05/31 07:46:48 (permalink)
    Hi all 
    sorry for delay I've been away and thank you for your replPies. 
    I will replace brake switch and check out the Maf sensor. 
    Can someone explain how to check maf sensor. 
    Many thanks. 
    Gavin. 
     
    wibble
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    wibble PCGB Member
    Re: Abs/ psm light on all the time 2019/05/31 11:21:26 (permalink)

    Tony
    1999 996 Carrera 4 - Ocean Blue
    Past:
    1990 944 Turbo - Guards Red
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