Hello all you very knowledgeable people!

 

I have a fault with the ABS on my 2006 Octavia Elegance 2.0TDi PD 140. Turn ignition on and only the ABS light is illuminated. When you drive off this light goes out, but once you hit a certain speed (maybe 10mph / 15kph?) the ABS light and the traction control lights both light up yellow. Also the ASR button on the central console lights up too as if you've manually switched it off.

 

VCDS found the following fault:-

 

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Address 03: ABS Brakes        Labels: 1K0-907-379-MK70.lbl

   Part No: 1K0 907 379 P

   Component: ASR FRONT MK70      0105 

   Coding: 0017025

   Shop #: WSC 73430 790 00000

   VCID: 3F87325817E6

 

1 Fault Found:

00287 - ABS Wheel Speed Sensor; Rear Right (G44)

            003 - Mechanical Failure - Intermittent

 

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However, displaying group 001 of the measuring blocks for the ABS controller appears to show that all is well. All 4 sensors, including the rear right are registering the same speed. I cleared the error but it came back again almost immediately once I hit the magic 10mph speed.

 

I've not been able to test much as I only talked the wife into driving round the corner for 1 minute - looking VERY closely at the measuring block readout for the rear right sensor, it appear to lose a couple of mph now and again. For example if travelling at 20kph, all 4 sensors would be displaying 20kph but every 5-10 seconds the rear right might drop to 17kph then back up again which I guess is what is flagging the error.

 

So..... Do you think it's worth replacing the sensor? Or is it more likely that the fault lies somewhere else but manifests itself from the viewpoint of VCDS as a fault with the sensor?

 

I've not had the wheel off and taken a good look yet - I'm more of a computer techie than a mechanic!! Interestingly, about the same time this fault first occurred, we got a slow puncture in the rear right tyre which we had to replace in the end. I think it was a screw. Probably a complete coincidence but I thought I'd mention it just in case.

 

Any advice is gratefully received!

 

Many thanks in advance,

Matt.

 

Oh and MERRY CHRISTMAS!!!! 

From another nearby similar thread - http://www.briskoda.net/forums/topic/298463-ho-ho-ho-no-no-no/

 

Ignore the bits about the Teves, you don't have it (ASR Vs ESP).

Mine is on now too AGAIN.

 

That'll be the 3rd this year. The Padgid sensor has gone this time in less then 6 months. Getting it replaced with VAG tomorrow.

 

Good news is it's probably the sensor not the Teves. Even if it is the Teves it's not THAT big a deal now. The age od your car you can probably expect the Teves to pop sooner or later.

 

Bad news. Your car is the same age as mine so probably the same issues I've had. The ABS sensor is actually in two parts. The plastic 'sensor' itself and a magnetic ring set into the hub.

 

The magnetic ring rusts over the years and eventually a bit falls out and you get the error. Or the ring expands when it rusts and damages the sensor. VAG in their infinite wisdom have fixed the ring in place within the hub so you have to replace the whole hub not just the ring.

 

I've had both rears done this year and both sensors. As I said the Pagid sensor is playing up already so I'd stick to the OEM parts. The Pagid was only a little cheaper anyway.

 

Edited 18 December, 201312 yr by Aspman

Thanks Aspman, I'll whip the wheel off and examine the hub/ring for rust and damage. Probably more likely to be this than the sensor I guess?

 

Cheers,

Matt.

I had the exact same problem with my Octavia, It was the rear off side ABS sensor..

Thanks Doofy, I'll check the ring for excess rust damage and then swap out the sensor if required.

 

Cheers,

Matt.

Abs ring may be broken and moving.

(based on experience with a Seat )

Hello again,

Apologies for the noob question but am I right in thinking that in order to inspect the ABS tone ring the brake disc and caliper must be removed? I'm beginning to think it might be better for me to take this to the local Indy or main stealer considering I've never even changed a set of pads!!!

Cheers,

Matt.

That's the easiest way - you can just about see the ring without disassembling but the car needs to be off the ground so you can see it properly.

If you take the wheel off and jack the car up stick your head in the arch with a torch you can, just, see a small section (like 1cm) of the ring through a hole in the rear disk guard. With the car safely immobilised, you'll be able to rotate the hub and peer in to take a look at the ring. You can also get your finger onto it to feel it.

 

One other thing worth thinking about at the same time. The rear disk guards are aluminum and rot around the mounting bolts eventually it comes loose from the bolts but stays on the hub clanking around like a metal bin lid.

 

IF you're changing in the hub for the ABS ring I'd suggest it might be worth changing the guard at the same time. They're only £20 but the hub needs to come off to do it, 5min job if the hubs off anyway. Give it a wiggle and if it's loose at all I'd get it done at the same time.

I agree with checking the ring, I had similar behaviour with the dashboard lights on my car which was logging the following faults:

 

00290 - ABS Wheel Speed Sensor; Rear Left (G46) 008 - Implausible Signal - Intermittent
00290 - ABS Wheel Speed Sensor; Rear Left (G46) 003 - Mechanical Failure - Intermittent

 

The hub was replaced (the ABS ring isn't a single piece) and the car has been fine since, it seems reasonably common for 2006/2007 cars due to age.

 

John

Thank you for the updates and apologies for this late reply - been a busy Christmas!!

 

So I've logged a 2 minute drive using VCDS and created an Excel chart using the data:-

 

 

You can see the rear right reading (yellow line) generally is correct but occasionally losses a few kph. Sometimes it even gains a few?? Just wanted to gauge opinion before going any further. As mentioned earlier, I have very little experience of working with motors so don't particularly want to start removing calipers and discs. 

 

Could a knackered ABS ring cause these erroneous readings or is it more likely to be the actual sensor? 

 

The fault reported is: 

00287 - ABS Wheel Speed Sensor; Rear Right (G44)

            003 - Mechanical Failure - Intermittent

 

If this points to the actual sensor, can the sensor be replaced without removing the disc or is it a fairly involved job?

 

Thank you again,

Matt.

I just recently had the abs light ping up. The garage checked all the abs sensor hub rings and one ring was badly cracked and corroded. Mine is a 2007 Octy. Really surprised that for a mid age car that these rings crack and corrode ! We have an elderly 04 Volvo and not one abs squeak out of that. I wonder why they corrode and fail so quick ? I had to have a complete new hub and bearing just because the magnetic hub sensor ring cracked. :(

I just recently had the abs light ping up. The garage checked all the abs sensor hub rings and one ring was badly cracked and corroded. Mine is a 2007 Octy. Really surprised that for a mid age car that these rings crack and corrode ! We have an elderly 04 Volvo and not one abs squeak out of that. I wonder why they corrode and fail so quick ? I had to have a complete new hub and bearing just because the magnetic hub sensor ring cracked. :(

 

Happened on my 3 year old Hyundai, changed under warranty, apparently common on them so its not just VAG that sees this issue.

I just recently had the abs light ping up. The garage checked all the abs sensor hub rings and one ring was badly cracked and corroded. Mine is a 2007 Octy. Really surprised that for a mid age car that these rings crack and corrode ! We have an elderly 04 Volvo and not one abs squeak out of that. I wonder why they corrode and fail so quick ? I had to have a complete new hub and bearing just because the magnetic hub sensor ring cracked. :(

 

I think they're just the magnetic mild steel or similarly poor quality metal. The risg isn't the big deal it's the inclusion into a £120 hub. If you could change that ring without taking the hub off it'd be a 50p part.

I had same problem and thought it was the sensor, turned out to be the abs ring, eurocarparts wanted £79 for rear hub assembly, skoda wanted £130, my mechanic (mate of mine) got one from npa car parts for £39 plus vat, he fitted it for £35. Didnt even need to clear codes after he drove it down the street the light went off.

After a bit of faffing and trouble shooting today, it looks like I'll be doing the nearside rear hub on my wife's 57 plate 1.9tdi...

 

Any pointers on the part number?

Tools tip: you'll need a *short* M14 spline for removing caliper cage and M18 spline for the hub bolt (with a decent bar!). 

Has anyone got the part number for the hub with the sensor?

 

 

Had this exact fault in my car this week, VCDS said it was rear right wheel. I drove for a bit with VCDS logging the output of all four wheel speed sensors and analysed it when I got home, sure enough the rear right was intermittently showing a much lower speed than the other three even when driving in a straight line. ABS, TCS, and TPMS lights all illuminated and "ABS/TCS unavailable" message on dash.

 

Ended up having to replace both the wheel bearing (as the ABS ring is built into it) and the speed sensor. The ring had partially perished and a bit was loose and had worn a groove into the magnetic pickup. Total cost £178 at local garage. Doesn't even need DTC clearing, once you drive a few metres with everything working it will clear itself and all the warning lights go out.