ABS Ring Replacement (Rear Right) Has anyone done this on here?

[superdavelotus]

Hi alll,

I've been chasing a problem with my A6 C7 for about a week. Dash full of Christmas tree lights, ABS, airbag (I think), TPMS, traction control, stability control, parking brake. Upon searching, I came up with two answers, battery and ABS sensor. During lockdown I had a the same message and this was due to lack of use. So I charge my battery up and all was good for a year or so. Last week same thing happened, charged battery back up but nothing. So I fitted a new Bosch ABS sensor and whilst fitting, check the wiring and also that there was power going to the plug. I was getting approx 2.5V. So Over the weekend, I ordered and battery and fitted this yesterday. Each time I play around with the car, I get mixed results. This time, lights went away (after removing sensor again and refitting) and I was able to drive for about 5 mins or 1KM until lights came back on. Later on this drive, I swtiched off the engine and then back on and lights went out again. My wife went to work in it this morning and lights came back on when she went down the road. So I am thinking ABS sensor ring.
My question is how easy is this to replace on the rear and does anyone know the part number for this please? I've rung my garage and they can't look at it until next week.
Thanks in advance!

[GilliamOS]

That is a highly unusual failure for these cars. Granted I did them on my wife's FWD Escape many moon ago, it's not unheard of either.

Detail count; There are a TON of variations on these cars. Model year, engine, drive type (FWD or Quattro) all matter.

Now, all that said, Audi does not specifically call out a part for the tone ring on any axle. You would need to order the entire outer wheel shaft axle joint to get the ring included. It would honestly be less work and hassle to just replace the axle as one unit. Being in the UK, I cannot recommend a specific shop for an axle, but your shop may.

Good luck.

[superdavelotus]

Thanks for your reply. I've looked at pretty much everything else. I am getting power to the plug etc. When I took my new ABS sesnsor out, it had rust at the end along with abrasion marks where something catching it. I've even tried another new ABS sesnor incase the last one got damaged. My mechanic said that he thinks its the ABS ring and he's done quite a few on Audis. It might be our UK crappy weather as everything rusts and I am also by the sea which makes things worse. I'll see what see says next week when I get it into him. He said that he can get replacement rings too hopefully without buying a new axle as he's done this job a few times before.
I just wondered if anyone has tackled this job DIY?

[JackRWB]

Hi. Could you tell me please if you get any ABS sensor related errors? I have my A6 Allroad Quattro 3.0 V6 Bi Turbo 313BHP 2014 engine code CGQB.
I have the same issue. Christmas light and bloody annoying beeping. I tried almost everything. I've bought off ebay a used ABS pump with module and I swapped it. Still all the errors came back.
I've bought a new ABS/Speed sensor and plugged it in both sides to see if anything changed. No success. Now I'm waiting for a brake light switch as I read it can cause lots of trouble but I have no errors related to switch.
My ABS module simply loses communication and the computer cannot discover its presence. The interesting fact is that when I disconnect the ABS module plug and connect it again, then for a few minutes or seconds (always a surprise when) it gets back communication and I can read the codes related to lost communication with ABS module.
Does anybody have any idea what could be faulty? Is there a relay that might play with me or maybe the unit from ebay is also broken? I've never had any DTC related to bad sensor, bad wiring or anything like this.
Whoever will find the answer, will be rewarded

[Valpo A7]

A tone ring just seems an odd replacement as it’s just a chunk of metal. Wondering if you are actually having a module problem and not the ring problem. Might be worth taking it to a shop and paying the diagnostic fee for a certified mechanic to diagnose it.

[halik008]

what are the codes?

[superdavelotus]

Why do you think it's odd replacement? If it's corroded (which it is) or even damaged then the ABS sesnor won't get the correct signal as it maeasures the time between the high and low points of each tooth. I have diagnosed it to rear right ABS sensor but I've replaced this and it's still not fixed it. I've got VCDS and done a dianostic on it already. I've checked the wiring too and get constant voltage to plug.

[superdavelotus]

what are the codes?

I have a picture but the code is missed off. Rear Right Wheel Speed Sensor C101D 07 (137) - Mechanical Failure
Wheel-Speed Signal from ABS Control Module P1887 00 (039) Implausible Signal

As I've said before, I've put a new Bosch ABS sensor in and even ruled this out and put a different brand Delphi in just to make sure. I've also fitted a new battery because last year when I got the Christmas tree lights on my dash, it was low battery (even though it was pulling the same error codes).

[superdavelotus]

Hi. Could you tell me please if you get any ABS sensor related errors? I have my A6 Allroad Quattro 3.0 V6 Bi Turbo 313BHP 2014 engine code CGQB.
I have the same issue. Christmas light and bloody annoying beeping. I tried almost everything. I've bought off ebay a used ABS pump with module and I swapped it. Still all the errors came back.
I've bought a new ABS/Speed sensor and plugged it in both sides to see if anything changed. No success. Now I'm waiting for a brake light switch as I read it can cause lots of trouble but I have no errors related to switch.
My ABS module simply loses communication and the computer cannot discover its presence. The interesting fact is that when I disconnect the ABS module plug and connect it again, then for a few minutes or seconds (always a surprise when) it gets back communication and I can read the codes related to lost communication with ABS module.
Does anybody have any idea what could be faulty? Is there a relay that might play with me or maybe the unit from ebay is also broken? I've never had any DTC related to bad sensor, bad wiring or anything like this.
Whoever will find the answer, will be rewarded

Hi, I got multiple lights, TPMS, stability control, traction control, parking brake, ABS. This first happened during lockdown in 2020 and I charged up the battery and everything cleared. Now the problem has come back (on a very cold morning), I tried charging the battery again but no luck. I ran a diagnotic on it and it came back with
Rear Right Wheel Speed Sensor C101D 07 (137) - Mechanical Failure
Wheel-Speed Signal from ABS Control Module P1887 00 (039) Implausible Signal

I've replaced the ABS sensor and even tried two different makes because the first didnt' fix it. I have also fitted a new battery to rule this out as my old battery was the original one and was 11 years old. Incidentally, I tested my old battery a few days later and its reading 12.58v so it's still a good battery.
When I pulled my new Bosch sensor out to fit a new Delphi one, I noticed that the Boash sensor had rust marks at the end and also score marks like something is catching it.

So this is why I am leaning towards a damaged and/ or corroded ABS sensor ring. I have booked it in my garage tomorrow because I couldn't get any answers on here or other forums about replacing the ring DIY. My mechanic says that he thinks it's ABS sensor ring too and he's done several on Audis. He even said it's a common problem here in UK for Audis. Anyhow, only time will tell and hopefully I can report back on Wednesday with some good news.

[Valpo A7]

Why do you think it's odd replacement? If it's corroded (which it is) or even damaged then the ABS sesnor won't get the correct signal as it maeasures the time between the high and low points of each tooth. I have diagnosed it to rear right ABS sensor but I've replaced this and it's still not fixed it. I've got VCDS and done a dianostic on it already. I've checked the wiring too and get constant voltage to plug.

My chunk of metal reference for these cars is in error it seems. Could have sworn that they had the tooth tone ring.

I recently replaced a wheel bearing and wheel bearing housing on my A7 and still have the old parts laying around so I just went and looked at them. At least for the parts off my 2012 A7 you cannot replace just the tone ring as it is built into the wheel bearing. You need to pull the whole bearing and hub to replace the wheel bearing hub/bearing assembly. You will need access to a press to separate the old parts and to assemble the new parts. The bottom 2 bolts on the bearing are a real PITA to remove as access completely sucks with the whole wheel bearing housing still in the car. There is a shaft that goes through the housing that is basically directly in front of the bearing.

Bearing is about $100 USD. Complete "kit" for $195 USD.

Bearing: https://www.fcpeuro.com/products/aud...4-s5-4h0498625

Kit: https://www.fcpeuro.com/products/aud...-7136109700kt1

Bearing replacement: https://www.youtube.com/watch?v=oShEPD_7-kI

19:40 time stamp shows the access in the car. I was unable to get any tools square on it so I removed the whole assembly and used an impact to get the bolts out.

[halik008]

I have a picture but the code is missed off. Rear Right Wheel Speed Sensor C101D 07 (137) - Mechanical Failure
Wheel-Speed Signal from ABS Control Module P1887 00 (039) Implausible Signal

As I've said before, I've put a new Bosch ABS sensor in and even ruled this out and put a different brand Delphi in just to make sure. I've also fitted a new battery because last year when I got the Christmas tree lights on my dash, it was low battery (even though it was pulling the same error codes).

Clean off the sensor hole in the hub really really well. I had similar sensor fault on my B6 audi....turned out be just rust from the rotors throwing off the sensor reading. The sensor ring on these cars are buried inside the CV joint housing and sealed off in plastic/epoxy so the odds of the ring being corroded is pretty low.

"implausible signal" means the signal is scrambled....either too high, too long constantly so you ABS module could be shot. The DME uses the signal from wheels for other functions and it's seeing junk.

[superdavelotus]

My chunk of metal reference for these cars is in error it seems. Could have sworn that they had the tooth tone ring.

I recently replaced a wheel bearing and wheel bearing housing on my A7 and still have the old parts laying around so I just went and looked at them. At least for the parts off my 2012 A7 you cannot replace just the tone ring as it is built into the wheel bearing. You need to pull the whole bearing and hub to replace the wheel bearing hub/bearing assembly. You will need access to a press to separate the old parts and to assemble the new parts. The bottom 2 bolts on the bearing are a real PITA to remove as access completely sucks with the whole wheel bearing housing still in the car. There is a shaft that goes through the housing that is basically directly in front of the bearing.

Bearing is about $100 USD. Complete "kit" for $195 USD.

Bearing: https://www.fcpeuro.com/products/aud...4-s5-4h0498625

Kit: https://www.fcpeuro.com/products/aud...-7136109700kt1

Bearing replacement: https://www.youtube.com/watch?v=oShEPD_7-kI

19:40 time stamp shows the access in the car. I was unable to get any tools square on it so I removed the whole assembly and used an impact to get the bolts out.

I think you are correct, the ABS ring is magnetic and not toothed and is part of the wheel bearing. I've just dropped off my car, it hopefully should be fixed at the end of today. I'll let you know what the outcome is.

[superdavelotus]

I think you are correct, the ABS ring is magnetic and not toothed and is part of the wheel bearing. I've just dropped off my car, it hopefully should be fixed at the end of today. I'll let you know what the outcome is.

I've got the car back and it's all fixed. The ABS pick up is magnetic and is part of the wheel bearing. Total bill was £240 and this broke down to £120 for parts and £120 for labour. I could have done this myself thinking about it but I wasn't 100% sure it was this causing the problem and it would have taken me half a day to do this on my driveway. So all in all, very pleased and relieved on outcome.

[Valpo A7]

That is basically about $290 USD, that is a killer price.

What all did they replace? I am assuming a new bearing and then just pressed the old hub on and off. Hopefully they gave you new bearing bolts and axle bolt. Bearing bolts can be reused safely but the axle bolt, I always replace that if I remove it.

[superdavelotus]

That is basically about $290 USD, that is a killer price.

What all did they replace? I am assuming a new bearing and then just pressed the old hub on and off. Hopefully they gave you new bearing bolts and axle bolt. Bearing bolts can be reused safely but the axle bolt, I always replace that if I remove it.

It was a new wheel bearing kit, comes with 4 bolts and the centre bolt too. It just pulls out by hand and same going back.