Problem With Electronics

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Brooklyn, NY
#1
I was hoping someone could give me some suggestions on my problem. I was driving around 30-45mph on a highway and hit a massive pothole with both my left front and rear wheels. Biggest pothole I ever hit, I mean it was tremendous. The second after the impact my electronics died, my mph gauge sat at 0mph, my fuel gauge stopped properly reporting gas, my analog mpg gauge stopped working, my abs, brake, and DSC lights all turned on.

I had my shop try to diagnos the problem but they couldnt find anything wrong with the electronics. When I went to the BMW dealership they said I had a bent rim, and a bent control arm. I've had both bent before so I know what that drives like, but in this case my regular shop which is usually more competent didnt find either problem. The BMW dealership is telling me that because the wheel is off axis the computer is failing, which I find a bit far fetched since my friends Z4 has a very bent control arm so that his wheel visibly wobbles a lot but his electronics are fine. In my case you cant even see a wobble but my electronics are all out of wack.

The only sensible thing I heard so far was my friend who told me that the wheel sesnor may have gotten knocked out, but I dont know anything about the sensors to really tell if thats a possible cause. I've been driving with the electronics dead and maybe 3% of the time they actually do work. Like the lights go off and the gauges report everything fine, then after a bit of driving they all die.

Anyway, any suggestions I would greatly appreciate.

It's a 2000 328Ci btw.

Thx
 
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Location
Reading,PA
#2
That's a weird problem, it seems like one of two things happened:
1. The shock damaged the computer directly - cracked board, connector, etc. (Hard to believe, they are built to withstand vibration, etc.) or a connector in your instrument panel.
2. The dealer says since the wheel is off axis, the computer is failing. That's a stretch, WHY would that cause the computer to FAIL? I have a dubious answer to that. If the wheel sensor failed, the program could be very "confused" and locked up in a tight loop waiting for non-existent wheel data from the sensor. But this would be a great example of incredibly sloppy programming! Real time controller logic must be programmed to work around failures like this (I know from experience - it's part of what I do for a living).

I'm inclined to go with #1 - a jolted connector, circuit board, etc.
 
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Location
Brooklyn, NY
#3
The whole wheel axis issue seemed absurd to me too which is why I didnt ok them to do the repairs, especially at their rates. Im going to get new bushings and have my regular shop check out the control arms and if my rim really is bent. If after all of that the issue doesnt go away then I will have to goto BMW service again.

From past experience when I had work done on the control arm or on the rear axle the computer wouldnt work for about 1 day or so, and then it would start working again. Exact same thing would occur, ABS, DSC, brake light, and no mph. Although I think the fuel gauge worked. After a day of driving it would start working properly again.

Any other suggestions?
 
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Location
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#4
raiyu said:
From past experience when I had work done on the control arm or on the rear axle the computer wouldnt work for about 1 day or so, and then it would start working again. Exact same thing would occur, ABS, DSC, brake light, and no mph. Although I think the fuel gauge worked. After a day of driving it would start working properly again.

Any other suggestions?
That's really goofy - even though it makes no sense, it sounds like a software problem... [scratch]
 
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Location
Brooklyn, NY
#5
Hrm I thought it was something normal for the car to go through, but I guess if replacing a control arm isnt supposed to mess with the computer maybe its a computer problem. I guess I need to find a more relaible bmw service center.
 
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Lincoln, CA
#6
Not all service departments are created equal. Some are clueless about the most basic things and others are very competent. The dealer where I bought my car prolly would screw up an oil change. I found another dealer that seems to have very knowledgeable service advisors... even the parts guys were helping one customer with advice in rebuild his older BMW.
 


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