Invalid data from ABS control module
- Thread starter S5456
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I'd definitely recharge and check the battery health before doing anything else, then obviously drive it and clear all stored faults.
Edit- my 2011 S4 with only 32,000 miles, spat out an ABS fault code the morning that I was taking it for its MOT, not a nice thing for it to do!
Anyway, it was a faulty ABS front RHS sensor, the reason that it failed would have been that the wheel bearing is corroding and that caused it to make contact with the ABS sensor - I know this as the new ABS sensor is now getting worn down! So, now I know that this is a typical Audi failure and I'll need to replace that wheel bearing assembly - along with another new ABS sensor!
This might explain why, for many years, there has been a slight/quiet scuffing noise coming from what I've guessed to be, the front RHS drive shaft or brake area.
Edit- my 2011 S4 with only 32,000 miles, spat out an ABS fault code the morning that I was taking it for its MOT, not a nice thing for it to do!
Anyway, it was a faulty ABS front RHS sensor, the reason that it failed would have been that the wheel bearing is corroding and that caused it to make contact with the ABS sensor - I know this as the new ABS sensor is now getting worn down! So, now I know that this is a typical Audi failure and I'll need to replace that wheel bearing assembly - along with another new ABS sensor!
This might explain why, for many years, there has been a slight/quiet scuffing noise coming from what I've guessed to be, the front RHS drive shaft or brake area.
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I’ve driven it around a fair bit still can’t reset and is showing rear right sensor is at fault
I've just edited my first posting, hopefully not the same root cause of your failure!
Getting these ABS sensors out can be a bit tricky, as I was suffering from "total devastation" after getting that issue, I let my MOT place replace that sensor for me.
I have though, fabricated a "tool/aid" for removing these ABS sensors, utilising a wood-metal 6mm-M6 threaded stud the sort that gets used in furniture building for fixing stool legs onto the body of a stool, and used a short length of steel pipe as a "slide hammer" - though I did later discover that I had a small slide hammer that I could also make use of. So the plan for this car would be to either drill a 25mm deep hole down into the "sensor remains" after the top section breaks off when you try to remove it, alternatively use a gas torch to heat up a suitable wood screw and plunge it down into the sheared off ABS sensor remains, maybe shock cool it with very cold ice water, then pull that screw plus (hopefully) the remains of the ABS sensor remains. The ABS sensor hole is just over 10mm so clean it out to that size, DO NOT let anything get down far enough to make contact with the magnetic strip bonded to the inner face of the wheel bearing.
I bought my first replacement Bosch ABS sensor from ECP - it cost maybe £69, I did that in a panic the day that failure occurred, later I found and bought a couple of Bosch ABS sensors from "parts in motion" online, for about £18 > £20 each!
For your info, these cars only use 2 types of ABS sensors, type 1 for front RHS and rear LHS, type 2 for front LHS and rear RHS, which is very convenient, most VW Group cars use 4 different types!
Getting these ABS sensors out can be a bit tricky, as I was suffering from "total devastation" after getting that issue, I let my MOT place replace that sensor for me.
I have though, fabricated a "tool/aid" for removing these ABS sensors, utilising a wood-metal 6mm-M6 threaded stud the sort that gets used in furniture building for fixing stool legs onto the body of a stool, and used a short length of steel pipe as a "slide hammer" - though I did later discover that I had a small slide hammer that I could also make use of. So the plan for this car would be to either drill a 25mm deep hole down into the "sensor remains" after the top section breaks off when you try to remove it, alternatively use a gas torch to heat up a suitable wood screw and plunge it down into the sheared off ABS sensor remains, maybe shock cool it with very cold ice water, then pull that screw plus (hopefully) the remains of the ABS sensor remains. The ABS sensor hole is just over 10mm so clean it out to that size, DO NOT let anything get down far enough to make contact with the magnetic strip bonded to the inner face of the wheel bearing.
I bought my first replacement Bosch ABS sensor from ECP - it cost maybe £69, I did that in a panic the day that failure occurred, later I found and bought a couple of Bosch ABS sensors from "parts in motion" online, for about £18 > £20 each!
For your info, these cars only use 2 types of ABS sensors, type 1 for front RHS and rear LHS, type 2 for front LHS and rear RHS, which is very convenient, most VW Group cars use 4 different types!
Also, what I discovered was, these ABS sensors are roughly 400K ohms > 550K ohms when serviceable, the faulty one measured, the day that it failed, to be 1.4K ohms, after driving a further 40 miles, its measured DC resistance was down to zero - ie the windings were shorted out!
Luckily for me, my wife's car is a 2015 VW Polo 1.2TSI 110PS SEL 6MT, and for some unknown reason VW did not provide it at initial build, with brake wear sensing capability - and do not sell brake pads without wear sensors fitted, so I needed to cut off the pad wear sensor lead before fitting new pads - and that lead fits onto VW Group ABS sensors, so I had a convenient test lead for the S4 and any other VW Group cars with ABS sensor problems!!
Edit:- if you are doing this repair job yourself, don't be concerned if your scan tool can not clear all stored related faults after you have replaced the faulty ABS sensor, you might need to drive the car to clear the remaining stored faults.
Luckily for me, my wife's car is a 2015 VW Polo 1.2TSI 110PS SEL 6MT, and for some unknown reason VW did not provide it at initial build, with brake wear sensing capability - and do not sell brake pads without wear sensors fitted, so I needed to cut off the pad wear sensor lead before fitting new pads - and that lead fits onto VW Group ABS sensors, so I had a convenient test lead for the S4 and any other VW Group cars with ABS sensor problems!!
Edit:- if you are doing this repair job yourself, don't be concerned if your scan tool can not clear all stored related faults after you have replaced the faulty ABS sensor, you might need to drive the car to clear the remaining stored faults.
Thanks for the detailed advice on this particular job, managed to get it replaced few days ago with some butchering and persistence and help from someone with plenty of experience changing these which helped. Removing the very end of the sensor from around drive shaft is a surgery in its self. All faults cleared back to normal which is great. £50 and good few hours