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s3 fault please help?????

Discussion in 'A3/S3 Forum (8L Chassis)' started by 20vtdaz, Jul 9, 2007.

  1. 20vtdaz
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    20vtdaz Member

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    hi guys ive got a problem with my car, my ABS warning light keeps coming on and when i vagcom the car the codes im getting are longitudinal sensor implausable signal, or longitudinal sensor circuit faliure, ive paid someone to do this already to no delight so any help is welcome, thanks a lot, daz
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  2. simch
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    simch Active Member

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    Take it back to whoever you paid to change your longitudinal sensor!!

    It may be they have just not cleared the code on the ECU.
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  3. Effect
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    Effect Member

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    If the sensor is changed the fault does not re-occur even if it hasnt been stored in the ECU.


    The sensor you are referring to is a very common failure on S3s it seems cost about £80 and can be changed in about 15 minutes flat perhaps an hour the first time you do it.


    If this has already been changed it is quite possibly a wiring fault.
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  4. 20vtdaz
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    20vtdaz Member

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    how would i know if its been changed and where is this located, ive been told i can recalaberate it, is this correct, thanks a lot guys this is doing my head in,
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  5. Effect
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    Effect Member

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    How would you know ?
    Ask the bloke who was supposed to fix it for you, exactly what he did.

    That is the first place to start, without knowing what has been done we will probably just suggest you do the same again and then you are wasting money.
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  6. mastayoda
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    mastayoda Member

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    where is this sensor ? i need to do mine
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  7. 20vtdaz
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    20vtdaz Member

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    the guy that fixed the car has changed the lateral sensor? which he says is the headlamp leveller i dont think the longitudinal sensor has been touched, this any help?
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  8. s3ollie
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    s3ollie Member

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    im pretty sure the sensors are both together (come as one) and they are in the cabin behind the glovebox or steering wheel. the headlamp level sensors are attached to the runnig gear by the wheels nearside front and back
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  9. s3ollie
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    s3ollie Member

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  10. Stewart
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    Stewart Member

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    Thanks to me :)
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  11. 20vtdaz
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    20vtdaz Member

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  12. Stewart
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    Stewart Member

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    Please the threads properly, the longitudinal is the larger of the 2 in the pic...

    Unfortunately it is also the more expensive of the two.

    Don't know whether it's just me but your lack of punctuation makes it hard to read and understand your posts Daz.
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  13. mad max
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    mad max sixth gear

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    have you had the battery out lately because their is a plug on the side which is to do with the abs and if it is not plugged in properly will bring an abs fault up.also have you checked the three 30 amp fuses on top of the battery as one of these is for the abs may have blown.one more thing the fuses can look ok but underneath the fuse holder they can melt
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  14. 20vtdaz
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    20vtdaz Member

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    right ill start again then, my ABS light came on whilst driving so i booked the car in with a vag speacialist , they told me they had fixed the problem and that it was a faulty lateral sensor and so i collected the car assuming it was fine, then of course the light came back on, so i got a friend of mine to plug his vagcom into my car and the fault that came back wasnt the lateral sensor, but instead it was the longitudinal sensor,
    1, implausable signal
    2, electric circuit faliure intermittent
    im also now confused, are these the same or different sensors?
    what does it do?
    i cant find anywhere on that link where this sensor is mentioned? please help im going to nurburg on the 27th and my abs doesnt work while this light is on so im told,,
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  15. Effect
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    Effect Member

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    no no no the lateral and longitudanul are EXACTLY the same sensor.

    One is on passenger side one is on drivers side both under dash, the bigger of the 3 sensors (which is with the longitudanul under drivers side in my car) is the YAW sensor and costs about £320 the smaller two cost about £80ish

    none of them afaik are related to headlamp levellers it sounds like your auto-leccy doesnt really know what he is talking about.

    if you car is the same as mine you can remove the panel under the steering wheel by removing a few screws and then unclip a few wires you will then find
    this bracket with teh two attached sensors
    [​IMG]

    change the smaller of the two (will need to unbolt bracket to do this easily then just reattach it and plug both wires back in and all being well you should be good to go.

    If this doesnt solve your problem you are looking at a probable short or wiring fault somewhere which will need an experienced auto electrician to find.

    Regards
    James
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  16. Effect
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    Effect Member

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    You have been saying this for a while and I have left it unchalleneged until now just in case I am wrong.

    Are you 100% sure the larger of the two is the longitudanul ?
    because on my car it is the YAW sensor (coming from a VAG mechanic) i changed that sensor when i had a longitudanul fault and asked the mechanic and he said its cas you changed the wrong sensor mate you need to change teh smaller one, which i did and it cured my problem.
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  17. tbcuprat
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    tbcuprat Member

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    I've read this thread a few times. I'm confused on which part number is listed as the longitudinal.

    If I'm reading this right Daz you need to replace the sensor

    PN. 1J0 907 651A - longitudanul acceleration sensor.

    Located under the steering wheel cowling.
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  18. Stewart
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    Stewart Member

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    Ok, let me clear this up AGAIN (do a search for my earlier threads).

    The Golf 4 motion, Audi TT/S3 etc platform has 2 sensors with regard to this problem.

    One is a lateral acceleration (side to side twisting motion) also sometimes known as a........ YAW sensor.

    The other is a longitudinal sensor, sometimes known as a 'Pitch' sensor.

    On earlier cars, the 2 sensors were mounted separately from each other, one behind the glove box (longitudinal) and the lateral accel sensor on the steering column.

    On later cars (facelift and later), Audi refer to them as a 'combi' sensor and were mounted as you see in my pic above.

    The smaller of the two is DEFINITELY the lateral acceleration sensor (Yaw) and weighed in at £97 inc vat and took roughly 30 mins to fit.
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  19. Effect
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    Effect Member

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    In that case the explanation I have can be one of 2
    1 - You are wrong
    2 - they changed sensor posistions etc in different years (the most probable)

    There are two sensors under the drivers side bolted to the same plate
    the larger is the yaw sensor, the smaller is the longitudinal acceleration sensor.

    On the passenger side bolted to the a pillar quite low down is a sensor exactly the same as the longitudinal on the other side of the car ( same part number etc) but this one deals with lateral acceleration.

    This is on my car and the guy at the garage i bought my car from said he had dealt with lots of these and described to me pretty much what i have just described to you.

    The yaw sensor was confirmed not by a man at a desk at audi in the parts office but an actual mechanic in the workshop who deals with these sensors REGULARLY. He did not ask me what year teh car was, just me describing which sensors I had changed he knew straight away.


    Now Your car may be different they may have changed setups etc but I can tell you FACTUALLY that my car is setup as above.
    I drive a 2001 Y plate S3.

    Please don't take offence to this post bud, I mean no harm.

    regards
    James



    [EDIT] I just re-read your post and i remember now at the time being told that YAW and lateral accelerometers were different confused the hell out of me but that is apparently true.
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  20. Stewart
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    Stewart Member

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    The smaller of the two in that pic is DEFINITELY a lateral acceleration sensor (G200).

    If you really want me to labour the point, I will go and get the part number off the old part.

    The only grey area is when Audi changed the 2 sensors to one 'combi' sensor, I was told it was on facelift cars but as with any information from Audi, I cannot vouch for this.

    If you haven't changed the part yourself or have the old one to verify the part number i would suggest there has been some confusion. I'm not saying either one of us is wrong as there is a grey area over when Audi changed to the combi sensor.

    I did a load of research on this, both on the net and with parts filches with my old contacts from the industry.
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  21. Effect
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    Effect Member

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    on my car stew

    the lateral and longitudanul accelleromters are exactly the same part number (they are exactly the same part)

    I may be wrong on which is on which side though

    I rememb er changing both in my car and one solved the problem one didnt
    I had longitudinal failure.
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  22. Stewart
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    Stewart Member

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    Yours must be what Audi refer to as the combi sensor then. Can you post a pic of the old part and the part number?
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  23. Effect
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    Effect Member

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    I have the sensors in the picture you took, under the drivers side

    and then on the passenger side there is a single sensor (same part number as the small one on drivers side) attached to its own bracket.
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  24. simch
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    simch Active Member

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    Fight fight fight fight!!!
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  25. Effect
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    Effect Member

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    There wasn't one until now.

    You are a complete retard! If you read either mine or stew's posts properly you would quite clearly see that neither of us were starting a fight with the other.

    James.
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  26. simch
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    simch Active Member

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    You're going home in fxxxin ambulance!
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  27. Stewart
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    Stewart Member

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    Uh oh, Sim is pissed again.
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  28. Effect
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    Effect Member

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    LOL

    I must apologise for the previous post I was in one ******* **** of a mood, went out for a bike ride to clear my head and i feel at piece with the world again. (sort of)



    I'll give you a box of choccy biscuits to make up for it :D
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  29. Effect
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    Effect Member

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    can't work out if this is serious or not, being as i don't know you.

    I'll give you the benefit of the doubt though being as my post wasnt exactly friendly :)
    #29
  30. 20vtdaz
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    20vtdaz Member

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    ok guys, ive now replaced one longitudinal sensor, it was the one behind the glove box as i could find the one behind the steering wheel, i had a friend recalaberate the sensor as the readings as were miles out ( meant to be within -1.5 and + 1.5 ms ) mine was reading over 13.*** this went fine and was then reading within tolerence levels, but yet again a few miles in the car and ive got the abs light back up, ive read through the posts and it looks like i may have changed the wrong sensor, so where exactly is this located, i had the panel off that reveals the fuses and relays etc, is this right? or the small panel directly under the steering wheel, this little prob has now cost me over a grand and is becoming very stressful for me, any help would be great guys,
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  31. mad max
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    mad max sixth gear

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    maybe you need to start again
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  32. Effect
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    Effect Member

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    how the hell has it cost you a grand :eek:

    The other sensor is under the steering wheel not behind it, remove the whole panel that covers the lower part of the dash under the steering wheel (I dont think you can see the sensor you want without doing this)

    The sensor is to the left of the steering wheel I had to get upside down in the footwell to see mine the bracket has 2 sensors attached (the one you have changed and a bigger one) as in the abover pic and each of these has a wire going to it unclip these and undo the fiddly bolt bolting it to your steering column, then change sensor and put back together.


    Then if that doesnt work take it to an VAG specialist (I took mine to JBS in chesterfield and before I cured the fault it was booked in for a full day to go through the wiring looms to check for faults)
    #32

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