Had my mechanic replace the 2 front wheel bearings last week on CLS500. I also replace the front rotors and pads myself. when I took the car for test drive ABS and ESP warning lights turn on.  Check codes with Icarsoft I980 and got code for front Left sensor.  I replace it and I'm still getting same warnings. Check it again and got same code left wheel sensor. Went and got another sensor and replace it for a 2nd time and I'm still getting same warning lights and same code.   Could the mechanic have installed wheel bearing incorrectly?? Could the coded ring that the sensor reads be installed backwards??   

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Profile picture for user MBFanatic

Well it depends on the code. If you have open circuit to the sensor there is a damaged wire or bad sensor. If the connection is fine but it is not reading the speed then it is a installation issue. 

Can you please provide the fault code? 

Profile picture for user dbentancur

hi MBfanatic, I keep getting coda 43AF L6/1 front left speed sensor.  R/R twice with new ones to no avail.  Any suggestions???

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