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  #1  
Old 04-24-2009, 01:00 PM
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Default ABS Light

So Monday my brakes started sqeaking a little when I applied them. This morning I started my car and my ABS light and the (!) flat tire light came on. I looked at my brake pads on all four tires and they look pretty good still, I replaced them last summer. My rotors look pretty good too. Checked my tire pressure, and they are around 35. Any idea what might be causing it?
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Old 04-24-2009, 01:44 PM
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Wheel speed sensor would be the first place to look. If you know someone with the BMW diagnostic computer then can hook and and tell you exactly what is going on.
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Old 04-24-2009, 01:53 PM
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or a faulty steering angle sensor

The lights will go out after a couple of starts, if it's the steering angle sensor.
but I agree with Mr.Skurvy: Get the error codes to see what exactly is causing the lights..
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Old 05-26-2010, 06:54 PM
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so this happened to me on the way to work this morning... i'm hoping the lights go off when i turn oscar on later tonight.

if they don't, i need to bring it to the dealership? i don't know anyone with a bmw diagnostic computer.
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Old 05-26-2010, 09:35 PM
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Exact thing happened to me a few years back. Both my ABS and flat tire monitor (!) lights went on. It was the abs sensor. Look behind the rotor, there is a wire that is held into the knuckle (for the front) and on the rear hub (for the rear). It's and easy fix, but you'll need to know which of the 4 sensors it is. I guessed and changed out my driver's side front. As soon as I turned on the car, the light was gone.

A steering angle sensor would cause this sequence of lights to go on as well, I don't have DSC on my MINI, hence I knew it couldn't be that when I was diagnosing my problem.

While the light was on I had to do an emergency stop on the freeway and guess what, I had NO ABS. I've had to come down hard on the binders since I replaced the and all is well. I know emergency stops are un-avoidable, but use as much caution as you can till it gets fixed. Hope some of this helps.
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Old 05-27-2010, 02:42 AM
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I'm going to agree and BTW if it is a code that will go away it will take i believe 10 cycles are necessary to clear it by itself a cycle is defined as a full cold to hot cycle.
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Old 05-27-2010, 01:16 PM
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cool, thanks guys. it goes off and then comes back on again after about 30 minutes of driving. so i will check out the sensors this weekend.

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Old 06-02-2010, 03:30 PM
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so i didn't get a chance to check out the sensors this weekend... but now the DSC light comes on too... and it's not every time. sometimes they don't come on at all, sometimes its ABS & (!) and sometimes all 3. my brakes are not squealing, and they seem to work fine.... hmmmmmm

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Old 06-02-2010, 03:31 PM
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Sounds like speed sensor issues. I think wanderer had similar symptoms.
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Old 06-02-2010, 03:38 PM
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thanks rally...
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Old 06-02-2010, 03:38 PM
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Definitely sounds like a wheel speed sensor. Easy to replace. You just need to find the sensor that is going bad. You can pay the dealer for just a diagnostic & then replace it yourself, or have them do the whole enchilada.
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Old 06-02-2010, 03:42 PM
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i will probably do it myself. are there any instructions online? and by myself, i mean i will bake nick a cheesecake and he will do it for me. haha

so just make an appt with the dealer to do a diagnostic?
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Old 06-02-2010, 03:58 PM
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Quote:
Originally Posted by thebestever View Post
i will probably do it myself. are there any instructions online? and by myself, i mean i will bake nick a cheesecake and he will do it for me. haha

so just make an appt with the dealer to do a diagnostic?
Yea, they are basically plug & unplug. Good info here:

http://new.minimania.com/web/Item/NMS7620/InvDetail.cfm

I'd inspect them all for damage first in hopes of doing it without the diagnostic, but that's the quickest way to pinpoint which sensor it is otherwise.

How-to: http://www.northamericanmotoring.com...to-fix-it.html
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Old 06-02-2010, 04:00 PM
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PM Rick about IDing the right sensor without a run to the dealer. He may be able to steer you in the right direction:

http://www.northamericanmotoring.com...er-helllp.html
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Old 06-02-2010, 04:22 PM
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awesome... thanks mark. i just left a message at the dealership to see about a diagnostic. but i will definitely try to ID it first to save some $$!
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