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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 01-18-2013, 10:03 AM
Lyrred Lyrred is offline
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Location: Bahamas
 
Join Date: Jan 2013
Posts: 5
Mein Auto: 1999 528i, 1987 325is
ASC and ABS Light on. Transmission shift problem.

Hello all, a few weeks ago, my ASC and ABS lights on the dash were illuminated. This also caused my transmission not to shift. I checked the front left speed sensor and sure enough there was a broken wire. I then reattached the wire and surrounded it with electrical tape. The lights went off and the car worked normal again. I also ordered a new speed sensor.

Today I got home and decided that i would change the old speed sensor that i had fixed so i would not have to worry about it any longer. The connection was kind of stuck in there and i had to sort of break the connecting bracket. When i put the new speed sensor in the lights went off. Perfect! I then went to drive it and test the car. I reversed out of my drive way and when i put the car in drive, the lights came back on! I checked everything on the car and even tried putting the old one back in. The lights stay on.

Car: 1999 528i
Im stuck and i don't know what to do.

I know the write up is long. Please help.


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  #2  
Old 01-18-2013, 12:07 PM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
 
Join Date: Mar 2008
Posts: 20,991
Mein Auto: 02 BMW 525i M54 auto 130K
Quote:
Originally Posted by Lyrred View Post
Im stuck and i don't know what to do
I realized you found a broken wire and repaired it - and then replaced the sensor - but still - I'd recommend starting with the basics ...

- Basic testing of ABS sensors (1)
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See also: E39 Bestlinks & How to easily find what you need
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  #3  
Old 01-19-2013, 08:44 AM
ztitans1 ztitans1 is offline
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Location: Texas
 
Join Date: Apr 2011
Posts: 67
Mein Auto: 1997 528
Same issue here

Quote:
Originally Posted by Lyrred View Post
Hello all, a few weeks ago, my ASC and ABS lights on the dash were illuminated. This also caused my transmission not to shift. I checked the front left speed sensor and sure enough there was a broken wire. I then reattached the wire and surrounded it with electrical tape. The lights went off and the car worked normal again. I also ordered a new speed sensor.

Today I got home and decided that i would change the old speed sensor that i had fixed so i would not have to worry about it any longer. The connection was kind of stuck in there and i had to sort of break the connecting bracket. When i put the new speed sensor in the lights went off. Perfect! I then went to drive it and test the car. I reversed out of my drive way and when i put the car in drive, the lights came back on! I checked everything on the car and even tried putting the old one back in. The lights stay on.

Car: 1999 528i
Im stuck and i don't know what to do.

I know the write up is long. Please help.


Sent from my iPad using Tapatalk HD
Hello I had the same issue. The fix is simple and I think you are on the right track. You probably have the same issue I have. I had this creep up on me a few times before notably when it rained. My ABS and Traction Control warning lights would illuminate and the car needed to be shifted manually to shift gears. The problem went away twice previously so I just thought that is odd and proceeded with life.

Last week it happened again and the issue persisted.

After much research I found the following temporary fix.

1) Jack up passenger front.
2) Remove wheel.
3) Remove Speed Sensor from back of drum. It is a wire going into the body of the sensor held on by two allen screws.
4) Clean Sensor.
5) Use compressed air and clean out cavity where sensor was removed from.
6) Reinstall.
7) Drive car and eventually codes will clear.

I have discovered it appears my passenger front strut is leaking hydraulic fluid. I believe that got into the wiring & in the area where this sensor goes so it made it go out (short circuit).

For me it took driving the car a couple of times before it reset itself. Be patient and see if this works. At first the lights went out briefly then came back on. Now it is working fine.


I have a major repair ahead of me with the struts.
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