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Old 13th October 2012, 07:23   #11
tampamark
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Quote:
Originally Posted by 0gravity View Post
Tough steering not as much, the transmission malfunction once the car warms up which happens to be a symptom of the angle sensor. I have no idea how BMW made these parts talk to each other so much as to render the car useless at times for a sensor. It is VERY annoying...I am already shopping around for another vehicle because I am out of warranty. The cheapest thing for you to do is check your power steering fluid first located at the top left and then change the steering angle sensor. I am sure those two would alleviate your problem.
If it is your steering angle sensor it may not necessarily need to be replaced.

The steering angle consists of two parts, an optical disk that is on the steering wheel that you remove. Then there is a circuit board on the part of the steering column that the wheel attaches to, on this is a LED of some type. As you turn the steering wheel the light hits the optical disk which has some markings, this tells the system what angle the steering wheel is at. Some have had luck simply removing the steering wheel and cleaning the disk, then also cleaning the light on the circuit board. The second link below has a good illustration of where and how to get to the angle sensor, however it is an E90 so it is a bit different getting to it. The first link has a guy with an M5 that discusses these differences. You only have to reprogram if you fully replace the sensor, removing the steering wheel and cleaning does not. Also, there is a post on here from a guy who noted the differences in removing the M6 steering wheel, the M5 instructions below are not 100% the same.

Cleaning:
Steering angle sensor DIY fix - it worked

Others have had to repair or replace the board that has the light. When they repaired it they re-flowed some solder (carefully) in order to fix cracked solder traces. If you have to replace the board you have to take to the dealer to code the change, unless you are a coder yourself!

solder flow:
My $0.02 Steering Angle Sensor Fix - BMW 3-Series (E90 E92) Forum - E90Post.com
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Old 14th October 2012, 06:03   #12
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I strongly doubt it is the steering angle sensor. Symptoms are different.
I suspect the main bearing in the steering pump itself. It is tough when first starting up and then loosens up. It is a strong sign that the steering pump is gone.
Dangerous thing is it may die while driving and you will be left with a steering wheel heavy as a brick, which will most likely lead you to an accident.
I would check the steering pump IMMEDIATELY.

George
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Old 14th October 2012, 16:38   #13
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Quote:
Originally Posted by gkinvest View Post
I strongly doubt it is the steering angle sensor. Symptoms are different.
I suspect the main bearing in the steering pump itself. It is tough when first starting up and then loosens up. It is a strong sign that the steering pump is gone.
Dangerous thing is it may die while driving and you will be left with a steering wheel heavy as a brick, which will most likely lead you to an accident.
I would check the steering pump IMMEDIATELY.

George
+1 I have never seen a steering angle sensor cause stiff steering. It is a non-contact optical sensor???
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Old 14th October 2012, 19:02   #14
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My 2c to help the fix along

From personal experience; Circa 2008, one year or so after purchase, my 07 M6 Cabrio, had that tight steering issue upon start one morning, but it did have a transmission fault displayed. The Steering Angle Sensor was in fact the issue, The sensor alone likely didn't cause the issue, however the sensor, as it was explained to me, is checked by a module and upon catastrophic failure will tell the module there is a fault which in turn ceases the functionality of the steering control, along with a fault code in red. Transmission fault. It's possible the mechanic working on the car at that time may have misdiagnosed, or even parts troubleshot the issue. But I wouldn't rule out the sensor so quickly as a possible candidate. The cleaning DIY is sure worth a shot as is a battery check.

My symptom was inability to turn the steering wheel easily, but I did have the transmission fault that wouldn't clear no matter how many times I tried. I still have the original battery to this day.
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Old 14th October 2012, 19:21   #15
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I had the same problem but also had a transmission error at the same time. The dealership updated the software and it was sorted out and have not had the problem again.
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Old 16th October 2012, 17:30   #16
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Mine was straight tranny fault red cog. I did the DIY cleaning on the steering sensor and it did not work. I am afraid I may need to buy a new sensor. This is sad.
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