940 ABS light - Page 2

peterl · Mar 9th, 2016, 17:18

Thanks Roger.
The sensors were replaced about two years ago. I will investigate the tone rings. Speedo is fine and the fault doesn't always happen!
When, if, sorted I will report back.
Peter

Delta66 · Mar 22nd, 2018, 21:09

The ABS warning light has started to show in my car. It comes on irrespective of I am braking or not. It sometimes comes on almost immediately I start the car and move off. I can also do journeys without it showing at all.

From what I can see, there is nothing obvious and there is no heat in the wheels (my first S80 preceded burning out a caliper with the ABS warning light coming on).

It stopped after I gave the wheels a really thorough clean with foam and gentle jet wash, so I hoped it was dirt. But it has started again.

The brakes work fine (though I have not slammed them on to try and activate the ABS).

Volvo want £104 plus VAT to do a diagnostic. Is there a cheaper diagnostic that would show what the fault was?

Is something like this worth a punt?

https://www.eurocarparts.com/ecp/p/t...SABEgLnYfD_BwE

Is it compatible?

Forrest · Mar 22nd, 2018, 22:33

If your car is recent enough to have the ODB2 type socket in the arm rest it is unlikely actually to be ODB2 compliant. There are various recipes on here for making a code reader for under £20. If you have the diagnostic unit under the bonnet just use that.

Mar 9th, 2016, 17:18	#11
peterl VOC Member Last Online: Mar 13th, 2016 17:33 Join Date: Jan 2011 Location: Barrow upon Humber	Thanks Roger. The sensors were replaced about two years ago. I will investigate the tone rings. Speedo is fine and the fault doesn't always happen! When, if, sorted I will report back. Peter __________________ Current 940 2.3 Auto

Mar 22nd, 2018, 21:09	#12
Delta66 Senior Member Last Online: Feb 23rd, 2020 19:46 Join Date: Oct 2015 Location: Erskine	The ABS warning light has started to show in my car. It comes on irrespective of I am braking or not. It sometimes comes on almost immediately I start the car and move off. I can also do journeys without it showing at all. From what I can see, there is nothing obvious and there is no heat in the wheels (my first S80 preceded burning out a caliper with the ABS warning light coming on). It stopped after I gave the wheels a really thorough clean with foam and gentle jet wash, so I hoped it was dirt. But it has started again. The brakes work fine (though I have not slammed them on to try and activate the ABS). Volvo want £104 plus VAT to do a diagnostic. Is there a cheaper diagnostic that would show what the fault was? Is something like this worth a punt? https://www.eurocarparts.com/ecp/p/t...SABEgLnYfD_BwE Is it compatible?

Mar 22nd, 2018, 22:33	#13
Forrest VOC Member Last Online: Today 10:43 Join Date: Feb 2008 Location: Gloucester	If your car is recent enough to have the ODB2 type socket in the arm rest it is unlikely actually to be ODB2 compliant. There are various recipes on here for making a code reader for under £20. If you have the diagnostic unit under the bonnet just use that.

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