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Hey, changed wheel hub assembly with OEM Mercedes hub.. Question is I now have dreaded abs and traction control lights on dash.. Scanner says the sensor has mechanical fault but when I stream live data the sensor is showing correct wheel speed at all 4 corners.. So sensor partially works? I never come across this before.. Any input appreciated
thanx
2011 w212
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Try doing a "teach in" using the Launch scanner. Not sure that's an option. But, as you said, if the live data shows all is working, you may just need to reset the wheel sensors.
Best you buy genuine MB wheel speed sensor, it wont be US$10 for sure.
Some sensors have rotational sensing capability, to tell the car is rolling backwards ( say during hill assist ) or in reverse mode.
So the N30/4 ESP computer would expect to see a different type of signal from such sensor.
Hey all
finally got around to replacing the front wheel speed sensor.I used this bosch sensor from rock auto and problem is fixed..This only cost 10$ and I'm sorry but bosh who's been around forever and was 35$ cheaper then original Mercedes sensor..Here is part number if anybody needs...Could not tell difference between the two visually..
Sweeet ..... now I know what alternative to buy.
Damn US$10 for a genuine Bosch, that is so awesome. I thought you got some funny brand when you said US$10
In my country this Bosch will sell for US$35 ish.
MB indonesia charges U$80 or so for MB branded one
Hey Sman.
Only reason I went with the Bosch is because I wasn't positive that it was the sensor..So figured spend a bit less.
So far so good..Car is now back to perfect..
I love my benz
One other thing I will add is..
I've read a lot of posts explaining how to remove the clip on the fender wall that holds the wheel speed sensor connection in place..
DONT TRY TO REMOVE THE CLIP BY PRYING UP ON THE METAL RETAINING CLIP..
Just take a small flat head screw driver and push the clip upwards on the side of the connection rather the top...This way it will not fly off and take your eye out..
Very simple and controlled this way..
So, it is true that in case of defective wheel speed sensor, you get the wheel speed reading but a substitute value....but the module does report the fault as wheel speed sensor.
Well, at least we know MB strategy now for bad wheel speed substituted value, it make it the same as other wheels.
When you scope the actual signal, perhaps it is visible , either the pulses/speed is totally gone or maybe erratic.
Well, at least we know MB strategy now for bad wheel speed substituted value, it make it the same as other wheels.
When you scope the actual signal, perhaps it is visible , either the pulses/speed is totally gone or maybe erratic.
that or a marginal signal level...?
it's amazin how these Bosch sensors age to loose their hability to sense magnetic ring... sometimes the ring itself needs to be replaced...
These sensors use molded plastic to be practically water tight.
$10 new Bosch sensor is a no brainer... perhaps testing a SIMPLE RELEARN COULD HELP while awaiting for new parts.
Last edited by CaliBenzDriver; Jan 12, 2025 at 12:25 PM.
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