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Old 07-15-2008, 05:33 PM   #1
rwdbmwm3
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1997 540I - ABS /TC - speed sensor module?

97 540I

took it to bmw they said its some "speed sensor" under hood, i guess its a module
its about $1500 at their dealership, i just want to be sure that once this is replaced it WILL fix the car

when i scanned the car it said "front left speed sensor plausibility" or something like that

any idea what this can be?
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Old 07-16-2008, 01:15 AM   #2
Dado 540
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does this issue cause any mechanical problems? or is it just that your speedometer is not acurate
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Old 07-16-2008, 02:54 AM   #3
rwdbmwm3
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2 problems...
ABS light, TC light

nothing more... common issues when speed sensor goes in normal car..

i tested (compared) left wheel sensor to right.. same resistance, same operating voltage,

not sure what to do... speed sensor for wheel is $200 + and the speed sensor under hood is $1600+
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Old 07-16-2008, 06:03 AM   #4
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does that mean your ABS is not working
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Old 07-16-2008, 09:06 AM   #5
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Yes. If the Speed sensor is toast the ABS or Traction will not work. I had the same issue and once i replaced my speed sensor everything went back to normal.

Not sure what the hell the sensor under the hood is though.
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Old 07-17-2008, 08:52 PM   #6
rwdbmwm3
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Quote:
Originally Posted by Soldo View Post
Yes. If the Speed sensor is toast the ABS or Traction will not work. I had the same issue and once i replaced my speed sensor everything went back to normal.

Not sure what the hell the sensor under the hood is though.


the prices at dealer are roughly.. $200 for speed sensor, or $1500 for the "speed sensor" (i assume module) under hood
i dont want to pay bmw a penny.. i tested the speed sensor (as much as i could without any specs to compare..

i compared the "faulty" speed sensor on left side.. to the one that did not come up as faulty on the right... identical specs..

ANY SOLUTIONS!?!

i asked bmw, they said the speed sensor is underneath the hood.. i dont know why they call it a speed sensor, i assume its a module.. they said that is faulty, i dont really want to waste an extra $200 if it isnt the speed sensor ..

scanner popped up Front Left signal plausibilty,
so i compared voltages and resistances from left to right...and its identical
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Old 07-17-2008, 09:02 PM   #7
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Bro, I had a 97 540 for 5 years and just sold it a month ago (the engine died at 350k, not worth rebuilding for me). Though I completely adored the car, I don't miss the problems. You've posted on here with a few problems. I wish you well. Watch your pocket book
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Old 07-18-2008, 12:06 AM   #8
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I'm parting a 98 540i...have most ABS components...The module is $200, so not even close to dealer cost!
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Old 07-18-2008, 11:43 AM   #9
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i had the same problem, with mine it was the abs/wheel sensor cost about 150 bucks in part. at first the friend/mechanic said that did not fix it and he said it has to be the ABS module, but after disconnecting the diagnostic computer and reconnecting it the issue was resoved, just make sure the mechanic who troubled shoot this for you did the same thing, the abs module if faulty is very expensive.
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Old 07-18-2008, 11:49 AM   #10
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the abs/speed sensors can be tested with the volt meter,, the abs module is the one under the hood with thin tubes coming out of it next to front passenger wheel.

as i said just make sure the diag computer is reset when you change the abs/speed sensors to see if the issue is gone.

most of the time the fault is caused by corrosion around the connectors.
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