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      09-16-2018, 06:38 AM   #1

Drives: BMW E92 M3
Join Date: Aug 2018
Location: Sydney, Australia

iTrader: (0)

DSC Issues HELP!!!!

Hi Guys
At this point im getting pretty frustrated trying to figure out what to do at this point. Ive been getting the following warnings in the iDrive system (Ive attached the errors shown below) and when they come up they disable my cruise control. Also when the errors come up the car becomes VERY sluggish, it doesn't want to downshift and there is no difference between full throttle and part throttle. These errors come on and then go away seemingly at random.
When i got these issues at first i did some reading and found that its common for the rear wheel speed sensors are prone to failure so i replaced them. The issue went away for about 4 days and popped up again so i decided to get the codes scanned.

I got the codes scanned and got the following codes:
5DA3: Wheel speed sensor, front right faulty
5D93: Wheel speed sensor, front left faulty
5DB2: Ring gear, left rear faulty

I understand that ill need to replace the front sensors now but i have NO idea what to make of the last code. ANY help is greatly appreciated.
Thanks in advanced.
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      09-16-2018, 08:44 AM   #2
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Theodore's Avatar

Drives: 2011.5 E92 M3
Join Date: Oct 2015
Location: Tampa Bay, FL

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My experience is that the last code (5DB2: Ring gear, left rear faulty) is for the rear left rear wheel bearing magnetic ring failure.

Here are links to two additional members who experienced the same error code and found they also needed a new rear left wheel bearing:



The wheel speed sensor detects a magnetic ring inside the wheel bearing to determine wheel rotation (or vehicle) speed and on the E9X M3 the rear left speed sensor and wheel bearing report speed information to the car for operation of the cruise control. The car can drive terrible when these parts don't work properly.

The two front wheel speed sensors didn't fail simultaneously with the wheel bearing from a third, rear wheel. That's something some (or many?) dealerships would tell their customers. In my experience, when either front wheel speed sensor fails, cruise control still works on these cars as long as the rear left wheel speed sensor and wheel bearing are working properly. The sensors up front are simply reporting information that conflicts with the information being collected from the failing rear sensor/wheel bearing. It's worth trying to replace the rear left wheel speed sensor first since it is relatively cheap, easy to install and a wear item, but be prepared that your problem is most likely the rear left wheel bearing. The BMW wheel speed sensors and wheel bearings are a re-boxed item, so you can save some money if you don't need the assurance of the BMW label on your parts box. Here are the exact parts without the BMW labels you will need:

BMW E9X M3 rear right or left, ABS Wheel Speed Sensor = ATE 360118 or 24.0711-5191.3 or 34526870077

BMW E9X M3 rear wheel bearing, right or left (45 X 85 X 41 mm with magnetic ring) = F.A.G. 805560A
E9X M3 Common Torque Specs Can Be Found Here
E9X M3 Exact Original Equipment (OE) Equivalent Parts Can Be Found Here
What I Wish I Knew When I First Bought My E9X M3 Can Be Found Here

Last edited by Theodore; 09-16-2018 at 08:49 AM.
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