Thanks for the last message above. I finally located the ABS rear wheel speed sensor on my 1994 E320 wagon. As far as I can tell, it is the only one rear speed sensor, not two as some reported to say have that. By definition, the ABS wheel speed sensor is LEFT side of the driver side, when in fact, I noticed the wheel speed sensor is only one and in the middle. Confusing, huh?The ABS rear wheel speed sensor is located on above the differential axe in the middle on top. Just barely enough room to feel the sensor and not enough room to see and to remove the bolt from the sensor, since I am under the ground on my back looking up with limited view of the sensor using the two ramps to lift the back end. I wiggled the sensor as to see and feel it is loose. It is not loose. However, I did see a line cable from the sensor going through the underbody of the wagon. However, I cannot find the end point of the cable so I can unhook it to measure the resistance without taking the ABS wheel speed sensor off from the differential axle. Some people say the end of the cable is located under the back seat. So I removed the back seat and no end cable is found. Some people also said the end cable is in the rear compartment. Where is the rear compartment is located? Is it behind the cover on the right side near the rear passenger tail light where the jack is stored? I don't think so, due the line of the cable is going forward under the body toward the right passenger side past the backseat.

I am tempted to take the wagon to the shop for the mechanic to remove the sensor and replace a new one, because I am afraid that I will stripped the bolt with limited play and cannot see to remove the bolt from the sensor from under the ground. The total cost will be around $380 including labor and a new ABS Wheel Speed sensor part. Any suggestions or ideas is greatly appreciated.