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X3 E83 (2004 - 2010)
Talk about the E83 BMW X3 in this forum!

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  #1  
Old 05-10-2015, 04:44 PM
cconn cconn is online now
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ABS activates only on left turns

My 2008 X3 with M Package just started doing this recently. I notice it on most left turns at or above 20 mph. Usually not when slower than 20 mp and NEVER on right turns. It will usually last about one second, during which the indicator light comes on the dashboard. Then everything is back to normal until the next hard left turn. All tires are the same, with equal pressure, etc.as I have always had since I've had the car. Anybody know what's going on? Thanks!
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  #2  
Old 05-10-2015, 06:04 PM
Supercourse Supercourse is offline
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Mein Auto: 2004 X3 2.5i
Don't think that has ever been reported on this forum - ABS dash light flashing on with LH only turns (not braking presumably) with no other stability control or other lights coming on with it.

Accompanied by the audible warning tone too?

ABS includes electronic brake force distribution (EBV) to assist in smooth deceleration, so it sounds like a fault in that sub-system.

I wouldn't expect something like the ABS pump or the control module as that would affect RH turns as well.

Maybe a touchy speed sensor or wheel bearing on one side.

A pro level OBDII scan tool reports on ABS codes so that should be the first step.
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  #3  
Old 05-10-2015, 07:43 PM
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AzNMpower32 AzNMpower32 is offline
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I'm also thinking wheel speed sensor.
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  #4  
Old 05-10-2015, 10:12 PM
joylove joylove is offline
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wheel speed or steering angle sensor. Get a C110 connected and look for stored DSC errors.
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  #5  
Old 05-12-2015, 10:06 AM
cconn cconn is online now
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Thanks for the input. I was thinking speed sensors also. I had read on some non-BMW site that it is usually the opposite side, meaning the sensor on the right side gives you problems on a left turn. I checked both right side sensors - they seemed intact although dirty. Cleaned them but the problem did not go away. I'm going to do the same on the left side, and I'll get a code reader. Does anybody know:

1. How to determine which corner is the problem? Will the code reader identify the location or just generically that one of them has something wrong?

2. How to replace the rear ones? It looks easy on the front, but on the rear, the speed sensor wire seems to go forward such that I'll have to remove the body panels (maybe specific to M Package) to get to wherever it terminates.
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  #6  
Old 05-19-2015, 08:10 AM
kenza kenza is offline
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Before doing anything, check your tires. There is a chance you might have something (nail, screw, etc) in one of tires. It happened to me couple of times and symptoms were the same.
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  #7  
Old 05-28-2015, 02:57 PM
cconn cconn is online now
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Thank you Kenza and others. Update: I've now inspected and cleaned all 4 wheel speed sensors with no impact on the problem. There are no nails in any tires, but I did recently have a tire patched. I don't see how that could affect anything, but does anybody have thoughts on it? (Comments from the gallery about patching versus not patching will not be helpful!) Not gonna replace brand new tires because of a small nail, and I'm not taking this car on the track.
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  #8  
Old 06-23-2015, 07:21 AM
kenza kenza is offline
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Ccon, did you check the tire pressure? When you patched the tire, it is possible they did not inflate it to the same pressure. X3s are very, very, very sensitive to tire wear and pressure.

BTW, I just had removed this bastard from my rear right tire. And the car was flashing 4x4 in left turns
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Last edited by kenza; 06-23-2015 at 07:27 AM.
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  #9  
Old 06-25-2015, 07:18 AM
cconn cconn is online now
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Thanks again Kenza. I definitely don't have any foreign objects like nails in any of the tires, and the pressures are all identical. I always pump up my own tires with my very accurate bike pump, and I always do this as soon as the tires cool down after coming back from the shop too, since they usually don't inflate them equally.

I guess if the sensor could be picking up differences based on that little screw in your picture, it's possible that it could be picking up differences based on a little patch inside. I personally still can't understand that, since the speed sensor is just counting revolutions and foreign objects would not affect that in the least. It makes sense to me for uneven treads or pressures, but that is not the case for me.

Well, I'm not buying brand new tires again, so I will probably be living with it for a while, unless I figure anything else out. If it goes away as soon as I finally get new tires, I will let everybody know!
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