Hi guys
I have just had the front wheel bearing changed on my stilo. Picked it up just as the garage was closing. Got down the road and the dashboard lit up like a xmas tree with constant beeps of abs ebd failure.
Is it likely to be the sensor or the the ring that the sensor picks up?
I have plugged it in to multiscan and it is say both front wheel speed sensors!!!

Surprising that fault should be both front sensors, unless both bearings were changed.

Common to a lot of cars the bearing contains the pulse ring for the speed sensor. If the bearing is fitted the wrong way around, there will be no signal. You'd hope that all garages would be aware and careful about this, but perhaps not. If this is the fault, they might be able to turn the bearing around, or it might need another new one. (Their cost)
In doing the job they will have disconnected the speed sensor. Grovel underneath and check they've refitted it and the mounting is not out of position.

If it is not an obvious bent bracket or disconnected wire, take it back on Monday. It wasn't broken before they replaced the bearing so they have disturbed something. They will fix it for nothing!

Meanwhile, the brakes will work normally, you will just not have the benefit of anti-lock or anti-skid if fitted. Speedo may be upset as usually this is driven from the speed output from the ABS ECU, having taken an average of the four wheel speeds.

I had all four wheel bearings changed and a new set of front pads while they were at it because there was a bearing noise coming from one of them but i couldnt make up my mind which one. LOL

You don't need to remove the rear ABS sensors to replace wheel bearings, so it's more likely to be a problem with the front ones which do need to be removed.

Check that the garage has refitted the sensors correctly. They should look like the one in this picture, but without the hexagon removal tool.
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Yeh thats what multiscan ecu confirms its at the front of the car on both sides. I just wonder if its the the sensor or the the ring that the sensor picks up that may have been disturbed whilst they pressed the new bearings in. I am beginning to suspect the ring. Dont know how much they will be though!

You can't buy the magnetic ring separately, it's an integral part of the bearing.

Other possibilities are: they may have fitted the bearing the wrong way round. The magnetic ring should face inwards towards the sensor. Or they may have fitted the bearing retaining circlip incorrectly. A gap in the circlip should line up with the hole the sensor goes through. If it was fitted incorrectly, they may have forced the sensor in and damaged it on the circlip.
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So do you think its the sensors themselves that are the problem rather than the rings?? Gonna take it back on Monday morning first thing to hopefully get them to sort it out. Already sick of the beep beep beep!!:bang:

Print off Davren's two posts above, with the pics and take these with you. Be prepared to show them to the garage if/when you believe they need to be told how to do their job properly.

From the above posts there are 4 possibilities. (Unless anyone can add any.)
1. Bearings in wrong way around. Least likely, as this is now a common situation and all garages should be aware by now.
2. Wrong bearings without ABS signal rings. Unlikely as all Stilos had ABS.
3. Connectors not plugged in. Needs checking but again less likely as a bit more obvious. Unless they were rushing a bit or distracted.
4. Circlip incorrectly positioned preventing sensor operating. Most likely and may have damaged the sensors requiring replacement - at their expense.

An update on where I am at now. The front abs sensors have been changed and this cured the problem on the right front. However the one on the left front is still showing an issue.
You can drive for 10 minutes and it will then go off! Or you can drive for 30 mins like last night and it will go off. Or you can drive for an hour and it doesnt go off. Its very confusing.
Have you guys any ideas as to where I might start looking .
In my head I am thinking dodgy connection somewhere (it is a stilo LOL) or dirt in in the new bearing that has been fitted in the hub giving a bad signal then triggering the abs warning.
Its only done it since the new bearings have been fitted.
Doing my head in.

Circlip in wrong place, impeding the sensor pickup would be my first thought.
Whatever, the garage broke it, take it back and insist they fix it.

Dont trust em now tbh! Think they have buggered it up. Anyway had the left wheel off this afternoon and checked the sensor. It was covered in gunk!! But now it shows a fault on both front wheels.

In the bottom left box on Multiscan it say the kmh speed at which it happened but underneath that it says brake light switch.
Could it mean the brake light switch is faulty?
Anyway gonna take it to a different garage toorow and get them to investigate. Like you said the circlip on both side could be in the wrong position or maybe the bearings have been put in wrong.
Either way it needs sorting out.

Making me think about getting rid of her though as losing confidence a bit!

I'm having this problem at the Mo,I had the wheel bearing changed and now my abs randomly kicks in when I use the brake,its gotten soo bad it's slowing my braking speed,the garage has taken the car back twice and cleaned the the sensors etc,when the car is Put on the computer it's coming up as a problem in the dashboard?? Plez help!! I'm in no position to buy a new car and I don't feel safe driving with my children.x

I'm currently changing my rear bearing but the new magnetic strip is right tight against the sensor which is not allowing it to spin freely, it's this correct?

phil7265 said:

I'm currently changing my rear bearing but the new magnetic strip is right tight against the sensor which is not allowing it to spin freely, it's this correct?

Click to expand...

No... there should be a small gap between the sensor and the magnetic ring. Assuming you haven't done anything with the sensor, then the new magnetic ring must be wrong.
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Davren said:

No... there should be a small gap between the sensor and the magnetic ring. Assuming you haven't done anything with the sensor, then the new magnetic ring must be wrong.
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Click to expand...

Hi Davren , thanks for that, managed to get it on in the end, God knows why it wouldn't fit but as soon as I tightened up the securing nut it was fine ??? one of life's many mysteries. Really appreciate the advice though cheers mate?