I got the rear wheel off to replace the sensor only to discover that I do not have rear left or right wheel speed sensors. The mounting location does not have a hole for the screw hole. Confused I contacted a Justanswer Mercedes tech who informed me that my car does not have those sensors but rather, just a speed sensor on the differential.

Now I'm confused because I thought the models with both ABS and ASR have left and right rear sensors. Mine are absent however.

The next question is then what does the error code mean? The 5 LED blinks in socket 6 corresponded to rear right sensor, according to the DTC manuals.

The sensors are absent on both my rear wheel hubs, no signs of them anywhere, yet I only get one error for the right rear.