R172 ABS sensor repair - Page 2 - Mercedes Benz SLK Forum

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#21 Old 11-05-2018
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Thumbs up Run Flat Indicator Inoperative

Thank you Robrowdy

Just adding to this problem of the front left wheel señor failing. The fault appeared on my LHD AU 2012 172 SLK 350.

Dash shows errors of "Run Flat Indicator Inoperative" and the ESC & ABS are disabled, also roof will not open dash says "Decrease speed"

Plugged in the Autel OBD11 tool and read error code front left speed sensor.

Crazy that the roof stops working???

Frewy
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#22 Old 11-05-2018
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Hi,

Relaced mine, was quoted £196 from local inde, bought sensor off ebay for £28, numbers were ground off sensor lead but the producers emblem was left on the plug end, exactly same as original merc supplier, hardest part was taking wheel off, took 20 mins, I then bought an isoft scanner for £96 to remove fault codes from dash.
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#23 Old 02-23-2019
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I just had the Right Hand Side speed sensor in my 2012 172 350 fail, 3 months after the Left Hand Side. I would suggest replacing both if one fails.

HOWEVER the RHS Sensor is NOT the same part as the LHS. The RHS also has a brake wear sensor combined in the same Y cable wiring harness with a single all in one connector to the car.

The Ebay site I sourced the RHS speed sensor from incorrectly said and supply the same one as the LHS.

Because I am a highly experienced electronics tech I simply cut the old sensor from the original harness and soldered the new sensor to the old Y harness.

There is a white and black wire inside the cable, solder these at a off set length so they can not touch even if the heat shrink fails. you need to use at least 3 pieces of heat shrink. 2 x 2mm 10mm long and one 6mm x 60mm long.

Best to practice soldering and heat shrinking this before attempting on the car. Its OK to solder in place the head unit CPU will not be damaged.

Or just take it to a auto electrician.
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#24 Old 02-24-2019
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Originally Posted by jerryt View Post
Well I now have my forth failed front ABS sensor. Each has failed shortly after turning the wheel to the stop.
The ABS cable can be routed so that it gets pinched between brake hose and the strut. I had to make sure it was routed forward of the brake hose, if routed behind brake hose, then when the wheel turns to the stop, a pinch can occur.

Time will tell...
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#25 Old 02-24-2019
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Lubing a lug bolt thread will change the torque when you put it back on.
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#26 Old 4 Weeks Ago
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Thanks for this post. My dash was lit up like a Christmas tree, and it looked awfully expensive. Your post helped a lot.

I did the right hand side. The VSS and the Brake Wear Sensor are clipped together and look almost identical. The only way to tell them apart is to trace the wires back to the wheel. The most difficult parts of the installation are bending the fender liner back and removing that wire clip without losing it. The rest of the job was a piece of cake.

I had to hold the fender liner back with a 2X4 in order to make enough space to get my hands to the sensor mounting. Then I pulled that clip out and lost it behind the fender liner. I took the bottom screw out and pounded on the bottom of the liner to see if I could shake it down and get it to fall out below. Luckily, that worked.

Once installed, it took me a few minutes to figure out how to erase the codes, and it took another minute for the car to stop remembering to light up the dash. Drove around a little bit, and couldn't get the wheels to spin anymore, so it must have worked.

Great post, I really appreciate it.
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