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Thread: Help with longitudinal sensor

  1. #1
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    Help with longitudinal sensor

    hi lads

    hoping someone can help me out on this one, got abs light fault on my V-reg 1.8T quattro A3. had it on vag machine and says its longitudinal sensor.

    beleive its behind the glove box on my model?

    whats it look like?

    also are the sensors all the same on different models and years? ie can i get one off a non quattro 1.8T thats say a 2004 model as im trying to source a 2nd hand one as audi want 120! n cant afford that.

    are they fitted on other models too, say just a base model 1.6 or an A4? and will they work in mine?

    cheers lads
    99 A3 petrol turbo - Quattro

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  3. #2
    Tastyterrier's Avatar
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    This is the sensor you're after (the one closest in the pic):
    http://www.bluevisions.de/projects/G...V_ESP_F007.jpg

    I have one in the garage but I don't know if it works. I was going to test it and stick it on EBay, but time has become a very limited commodity with the arrival of our first child.
    A3 1.8TQS: Supersport Springs and Shocks, Xenons, BMC Filter, 18" OEM TTV6's, Bailey DV, N75J and Phase 1 Custom Code.

  4. #3
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    thanks for that bud

    so its the small black on on that pic that looks to be incased and that alloy bracket?

    the one where you can see the part # sticker?
    99 A3 petrol turbo - Quattro

  5. #4
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    so is this one mine?

    took the side panel off the dash, and took the T25 bolts out, but couldn't get the 3 bolts out from inside the glove box as i couldn't get my screw driver into the gap.

    heres a few pics of what i was able to see from the side panel


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  6. #5
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    also can anyone tell me if these parts are the same no matter what model A3 it is?

    or is it only the quattro that has these?

    cheers
    99 A3 petrol turbo - Quattro

  7. #6
    Tastyterrier's Avatar
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    That's the fella. Looks like you'll have a fairly easy job getting it out. You need to prise off the bracket that goes under the sensor. I found using a small screw driver on one of the tabs either side of the connector, lifting and pushing the tab down, got it off. You can clip it back into place by hand.

    The sensor is needed by the Haldex quattro system, but I don't know if it's used on non-quattro as well. Not sure if it's different on earlier/later models, not sure when the ESP was introduced on these cars which may make a difference.
    A3 1.8TQS: Supersport Springs and Shocks, Xenons, BMC Filter, 18" OEM TTV6's, Bailey DV, N75J and Phase 1 Custom Code.

  8. #7
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    cheers for the help bud.

    just need to find out if there the same on non quattro models now, as i've found a 2nd hand one for 40 but its off a 2wd, dont wanna risk buying it to find it dont work
    99 A3 petrol turbo - Quattro

  9. #8
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    just rang audi n got a helpful guy on the phone.

    part # is 1J0907651A

    and he says the part is the same on the following models

    A2 2000-2005
    A3 1997-2003
    TT 1999-2005

    thats a bit of good news!
    99 A3 petrol turbo - Quattro

  10. #9
    Tastyterrier's Avatar
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    If you're local to me (Leek, Staffs), you're welcome to pop round and try the one I have out to see if it works, 40 quid sounds like a fair price so I'll just ask the same.
    A3 1.8TQS: Supersport Springs and Shocks, Xenons, BMC Filter, 18" OEM TTV6's, Bailey DV, N75J and Phase 1 Custom Code.

  11. #10
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    cheers terrier, thanks for the offer mate, shame im up in west yorkshire, cost me the same in petrol as it would to buy the part new lol

    well i got one off a lad on ebay, just fitted it notw, but still getting the same fault!!!! arrghh, starting to do my head in now.

    what could it be? is there another sensor a lateral one fitted on the steering column?

    could it be that one even though vagcom is saying its the longditudinal one

    any ideas where abouts it is n how i get to it?

    thanks again bud!
    99 A3 petrol turbo - Quattro

  12. #11
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    can anyone please shed some light on this? getting a bit stuck now and dont know what to do

    cheers
    Last edited by voorhees; 10th May 2009 at 19:16.
    99 A3 petrol turbo - Quattro

  13. #12
    MikeA3's Avatar
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    Havve you scanned the car again since fitting the new sensor?

    I think you need to recalibrate the sensor in vag.com after fitting the new part - there's a "how to" on the ross tech website.
    S3 AMK
    Bilstein B8's & Eibach Springs, Neuspeed ARB's (22mm front & 19mm rear).

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  14. #13
    Tastyterrier's Avatar
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    I've replaced both the longitudinal and lateral sensors in mine without the need to recalibrate, but I don't know with yours as it's a different year.

    The lateral one is easy to get at, you just need to remove the cover around the underside of the steering wheel. Remove all the screws (including the ones in the fuse bay) and tease it away from the clip either side of the steering wheel just under the clocks. I find it easier to also unclip the little plastic cover just under the clocks, simply pull back and lift.

    Stick you head in the foot well and look up and toward the door side, you'll see it on a metal bracket.
    A3 1.8TQS: Supersport Springs and Shocks, Xenons, BMC Filter, 18" OEM TTV6's, Bailey DV, N75J and Phase 1 Custom Code.

  15. #14
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    nice one again, terrier, i'll do that this weekend, i just try swapping the longitudunal & lateral sensors over, see if that makes a difference.

    and yeah i dont think it needs recalibrating, cheers anyway mike
    99 A3 petrol turbo - Quattro

  16. #15
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    well still not managed to find the frikking lateral sensor, stripped half the dash out and nowhere to be seen!
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  17. #16
    MikeA3's Avatar
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    I think the locations are different on the facelift models, on mine (early facelift) both sensors were held in place by a copper bracket under the dash to the left odf the steering wheel.

    I'm not sure on the pre-facelifts though?
    S3 AMK
    Bilstein B8's & Eibach Springs, Neuspeed ARB's (22mm front & 19mm rear).

    Badger 5's Machined Discs with DS2500 pads & HEL braided lines.

  18. #17
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    bugger, wonder where it could be then, as yeah mine is the pre-facelift model.

    heres some pics i took






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  19. #18
    Tastyterrier's Avatar
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    I think Mike's hit the nail on the head, mine is definitely next to the steering column on the drivers side in the big gap where yours obviously isn't. Maybe someone with a pre-facelift can help you out...
    A3 1.8TQS: Supersport Springs and Shocks, Xenons, BMC Filter, 18" OEM TTV6's, Bailey DV, N75J and Phase 1 Custom Code.

  20. #19
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    yep could be the case, now i just need to find someone with a pre face lift who knows lol

    cheers for all the help lads!
    99 A3 petrol turbo - Quattro

  21. #20
    MikeA3's Avatar
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    No worries mate, I've got a bad photo of where mine was located (not a lot of help to you I realise but other members may find it of use).

    S3 AMK
    Bilstein B8's & Eibach Springs, Neuspeed ARB's (22mm front & 19mm rear).

    Badger 5's Machined Discs with DS2500 pads & HEL braided lines.

  22. #21
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    yep unfortunatley it aint there on mine! lol

    thanks again mike
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  23. #22
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    well still no sorted n its MOT time again next week, i've had this fault 3 frikking years now! refuse to pay audi 600
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  24. #23
    MikeA3's Avatar
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    Have a look at vag-cat mate - It's an online parts database for vag cars and shows you where parts are located.

    Mine's still playing up even after i've changed the sensors - i've re-scanned the car and done some more digging into the fault code on the ross-tech website. Looks like the fault code can also be "set off" by a bulb not working properly.

    My high level brake light has 2 of the 12 LED's out so that's my next port of call in trying to fix this.
    S3 AMK
    Bilstein B8's & Eibach Springs, Neuspeed ARB's (22mm front & 19mm rear).

    Badger 5's Machined Discs with DS2500 pads & HEL braided lines.

  25. #24
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    well I just picked mine back up from the MOT station, the frikking ,light must have come on during the MOT! failed on ABS, and both rear springs knackered!

    you still having probs as well!?!? to say this fault is meant to be a common problem it seems very hard to get sorted.

    even a gone out bulb can cause this!?! rite i best get checking that as well!, know i have a side light out, but thats only recently gone.

    i'll have a scan on that Vagcat, cheers bud
    99 A3 petrol turbo - Quattro

  26. #25
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    well just rang audi to try n speak to a technician, they wouldn't give me any advice unless i take the car down to them to link up to their machine @ a cost of 99 +VAT, screw that!

    just had a look for the vagcat, is it the website www.vagcat.com? another forum? or im a looking in the wrong place
    99 A3 petrol turbo - Quattro

  27. #26
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    ah found the catalogue on that site, cheers bud!

    dont understand it tho!

    http://www.vagcat.com/epc/cat/au/A3/...01/57/2416960/

    what on here should I be looking at?
    99 A3 petrol turbo - Quattro

  28. #27
    MikeA3's Avatar
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    Try This link mate - http://www.vagcat.com/epc/cat/au/A3/...57/2416960/#25

    It should take you straight to the longitudinal sensor page - unfortunately the diagram isn't very good but it does show all the different parts that go with the sensor unit so might be of help.
    S3 AMK
    Bilstein B8's & Eibach Springs, Neuspeed ARB's (22mm front & 19mm rear).

    Badger 5's Machined Discs with DS2500 pads & HEL braided lines.

  29. #28
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    yeah thats the same page i posted, it makes no sense to me
    99 A3 petrol turbo - Quattro

  30. #29
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    ok, my car has just faile MoT on the ABS light......i had the car scanned a few months back and came up with the following?
    -------------------------------------------------------------------------------
    Address 03: ABS Brakes Labels: Redir Fail!
    Part No: 8N0 907 379 C
    Component: ABS/EDS 20 IE CAN V003
    Coding: 13504
    Shop #: WSC 06435
    1 Fault Found:
    01279 - Longitudinal Acceleration Sensor (G251)
    27-00 - Implausible Signal

    I called Audi for the Part and they want 107.10 + VAT.....does anyone know where i can get one or is it a stealer only part.
    also, the light only comes on when it wants to...what does this suggest? and is a new sensor likely to fix it?

    thanks.

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    Where Do I go From Here?

  31. #30
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    yep exact same as mine,

    no its a dealer part only, already tried yet

    bought a 2nd hand one and that dint work either not happy
    99 A3 petrol turbo - Quattro

  32. #31
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    My ESP light comes on every now and then and flags up the lateral sensor, done it twice tonight. All lateral and longitudanal sensors need calibrating when fitted, one day I'll do mine.
    S3, 4 wheels, magical B8's, Eibach, Pipewerx equipped, glass windows, metal engine, silver paint.

  33. #32
    LordNelson's Avatar
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    Changed my Longitudinal Accelleration Sensor at the weekend.....End result.....RESULT....ABS Light has gone off and stayed off....not had chance to do another scan yet though to check the fault has gone.
    Just need to sling it back through the MoT and we're good for another year

    2000 Audi S3
    1967 VW Beetle
    Location: Wakefield
    Where Do I go From Here?

  34. #33
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    Changed my Longitudinal Accelleration Sensor at the weekend.....End result.....RESULT....ABS Light has gone off and stayed off....not had chance to do another scan yet though to check the fault has gone.
    Just need to sling it back through the MoT and we're good for another year

    2000 Audi S3
    1967 VW Beetle
    Location: Wakefield
    Where Do I go From Here?

  35. #34
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    hi every1, i actually bought dave cawood's a3 with the fault and managed to sort it out :-) got a new sensor for 110 which made the ABS light flicker on and off intermittently as opposed to as soon as you slammed the throttle hard. the sensor does need coding if the sensor is well outta the parameters. maybe dave's used sensor would have worked if he did the following via vagcom:

    VW Golf (1J) Brake Electronics (MK60) - Ross-Tech Wiki

    either way, all sorted now :-)

  36. #35
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    got quoted 157 :o

  37. #36
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    not good my man: these are the guys i got it from, was lucky enough to have a centre near by: im sure they post it tho:

    Trade Parts Specialists

  38. #37
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    cool, already use them. on first name terms because of the S3

  39. #38
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    True say finesse. May as well set up a 30 a month direct debit to prepare for the inevitable next failure :-'(

  40. #39
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    So thread revival time.

    Ive got the abs light constantly on and scanned the car and yup, its the longitude sensor :/.

    So anyone know what the current price is for one? Is the above part number in this thread correct? Is this the right process to recode it:


    Longitudinal Acceleration Sensor (G251)

    Prerequisites:

    System voltage at least 12.0 V.

    [Select]
    [03 - Brake Electronics]
    [Coding-II - 11]
    Enter 40168, to enable the basic setting.
    [Do it!]
    [Basic Settings - 04]
    Group 069
    [Go!]
    Activate the Basic Setting.
    [ON/OFF/Next]
    After a successful basic setting, field 2 should say "OK".
    [Done, Go Back]
    To make sure the basic setting was succesful, check the sensor again.
    [Measuring Blocks - 08]
    Group 006
    [Go!]
    Check field 1, the value has to be between -1.5 and +1.5 m/s².
    [Done, Go Back]
    [Close Controller, Go Back - 06]
    Driving the most secretive S3 on ASN

  41. #40
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    Dani_B19 likes this.

 

 
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