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The only place for a coil spring is up Zebedee's arse.
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Joined: Apr 23 2019
Posts: 141

I got "Abs/ Traction failure" today. Nanocom read the fault as "normal rotation on all wheels, incorrect air gap on RHF sensor". The rubber boot on the sensor needs replacing, but I've been nowhere near that corner for a long while, so nothing's been disturbed. I was off on a drive, so all i've done so far is give the sensor a bit of a tap with a hammer to check it was seated properly, nada.... I'll pull it out tomorrow and give it a bit of a clean, and maybe blast the port with air. Any other thoughts? If spring cleaning doesn't work then I'll prob end up getting a replacement sensor.

Tnx, Rob

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Joined: Dec 30 2015
Posts: 3582

I turned the ignition on while one of the ABS sensors was disconnected and got the same fault before the car had even been started. Did it come on while driving or as soon as you started it?

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Joined: Apr 23 2019
Posts: 141

It came on as I was moving off, initially. Then I cleared the code, and the warning stayed off for a while, before popping back on

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Joined: Apr 23 2019
Posts: 141

Anyway, I removed the sensor from the housing/ cleaned it and greased it up again, all good now

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Joined: Dec 30 2015
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You managed to get it out in one piece? That must be a first. Glad it was an easy fix though.

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Joined: Sep 14 2016
Posts: 394

Well done on getting the sensor out. Green with envy!

Wondering if pulling the sensors, cleaning, greasing and re-inserting should be an every 3 years or so service job. Perhaps replace the tolerance ring style fittings too as they are cheap enough.

Clive

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Joined: Apr 23 2019
Posts: 141

Well, it wasn't very excited about coming out, but a pair of expandable pliers on the top and a bit of twisting/ wiggling and it was fine. Good point on the tolerance rings, I'll order some to have on hand for next time, one day my luck will run out (well, it does frequently, if i'm honest, just not on the ABS sensors)

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Joined: Feb 24 2017
Posts: 131

I put new new ones in and still got same ABS error message.
I removed one of the sensors again and used a flashlight to look inside opening where sensor goes. Looks like the hub that the sensor touches has a lot of corrosion on it and I’m guessing this is my “new” ABS issue.
Looks like I’m gonna have to pull the shaft out of I want the ABS light to go away....
Suggestions or comments?

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Joined: Mar 22 2016
Posts: 1119

Can you not get a dremmel or something similar in there to give it a clean up, without having to pull the shaft, is the nano not telling you which one ?

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Joined: Feb 24 2017
Posts: 131

It’s the left side.....
I’ll try getting something in to clean it. Beats the alternative.

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Joined: Apr 23 2019
Posts: 141

i,d worry about where the swarf was going to go... Compressed air maybe, as a start? And then shove a magnetic pick up in the hole as you manually rotate the wheel, to see if you can pick up any loose material. I guess the sensor is a magnetic pick up , so it could be sensitive to a bit of rust on the ring. if you have the patience then one of those fibre glass abrasive pencils and clean the ring tooth by tooth (it has c 60)

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Joined: Dec 30 2015
Posts: 3582

The crap falls out from around the CV joint. I've found an aerosol of brake cleaner blasts most of it out.

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Joined: Apr 23 2019
Posts: 141

Turns out my fix (replace and grease the RHF sensor) was only transient. In the few weeks since then nano has sworn blind that the air gap was too large on the RHF sensor. After greasing and replacing the sensor 10 times, i tried to get nano to work and give me the live wheel data - turns out the LHF was reading zero. Pulled out the LHF and cleaned it up, and we're back to normal.
I'm not sure whether to attribute the inaccurate error message to the nano or the WABCO ECU, but worth considering that those text messages aren't always accurate.

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Joined: Dec 30 2015
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Ahh, thought everyone knew about that one. Nano does report the wrong sensor on the ABS but correct on live readings. I think it was corrected on the latest firmware update

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Joined: Apr 23 2019
Posts: 141

err..no, and my nano was last updated about 3 months ago. Anyway, seems my saga is not over yet, ABS light came up again, but nothing reported on nano, bit weird.