Dear wise folk.

My 2001 Octavia 4x4 is stuck in the garage having failed it's MOT. The Anti lock braking system shows a fault with the Longitudinal acceleration sensor. My mechanic can find the latitudinal and rotational acceleration sensor but cannot find the LONGITUDINAL one. This is most frustrating as one can imagine. If anyone knows where it is located that would be a great help.

Many thanks,

Henry:confused:

I've got exactly the same fault and my understanding is that the sensor is under the steering column but I can't confirm that. My intention is to try and re set the measuring block values for the sensor on the controller because my (shareware) VAG COM shows them to be way out but I need the licensed version to do this - loans and help accepted.

I have read several threads on this problem both here and on the Golf 4motion site but non of them give a satisfactory conclusion. Is it a wiring fault, signal fault, duff sensor? No one seems to know but it's not uncommon.

Let me know if replacing the sensor works or if the fault recurs. If your garage recalibrates the controller I would also like to know if that works.

Dave

Does this help?

The sensor is number 15.

Thanks guys,

Great diagram, where did you get that?

It is just above the others on the steering column apparently. Around

Gents can somewhere say definitively where the location of this sensor is, is it behind the glovebox or under the steering column ?

My wiring diagrams say "On the Right A-pillar"  and here's a diagram

 

 

# 15 Longitudinal sensor G251

Fitting location

- Only RHD 4x4 vehicles on the central pipe to the right near right pillar - A -

My wiring diagrams say "On the Right A-pillar" and here's a diagram

Octy ABS Locations.png

# 15 Longitudinal sensor G251

Fitting location

- Only RHD 4x4 vehicles on the central pipe to the right near right pillar - A -

Cheers, so that's the one behind the glovebox then ?

Please tell me yes as it's the one I have removed and the other steering column one is virtually inaccessible !

Doesn't make sense that the post above says it's the one on the steering column ?

Edited 4 November, 20169 yr by TheBear

The wording would indicate it's on the drivers side below the dash  by the fusebox ?

 

#3 in the diagram is the G419 next to steering column under dash panel RHD 4X4 vehicles without G251 ???

The wording would indicate it's on the drivers side below the dash by the fusebox ?

#3 in the diagram is the G419 next to steering column under dash panel RHD 4X4 vehicles without G251 ???

But my car is RHD 4x4 that has the G251 longitudinal-acceleration sensor (old part number 1J2 907 638 A, new part number 1J0 907 651 A) ?

So surely it is #15 in the diagram ?

"15 - Longitudinal acceleration sender -G251

Fitting location:only RHD 4x4 vehicles ⇒ on the central pipe to the right near right pillar -A-"

Edited 5 November, 20169 yr by TheBear

Yes #15 is the Longitudinal sensor, but some 4X4 might not have it and use the sensor #3 next to the steering column

Yes #15 is the Longitudinal sensor, but some 4X4 might not have it and use the sensor #3 next to the steering column

Ross-Tech has told me code 01279:

http://wiki.ross-tech.com/wiki/index.php/01279

So I must have the g251 sensor ? Which would tell me it's #15 behind glovebox surely ?

 

Red Dot according to Autodata which backs up that previous diagram

Red Dot according to Autodata which backs up that previous diagram

Great so I am right enough in that it's the sensor located behind the glovebox on the passenger side then ?

No it's on the A pillar drivers side

 

 

 

If you look at the second pic #17 is the same sensor on a LHD

I've currently got half the dash apart; there isn't one located on the drivers side lower A pillar, only the ones under the steering column or behind the glovebox on the passenger side lower A pillar.

See below:

https://imgur.com/a/jgk1s

Nothing on drivers-side A pillar, see below:

https://imgur.com/a/vHzsu

Steering column sensors (x2):

There is the lateral acceleration esp sensor (same part number as longitudinal acceleration esp sensor) and yaw-rate sensor (yaw-rate is larger one and both sit on top of each other)

https://imgur.com/a/6SUEw