FWIW '06 doesn't use right/left rear wheel speed sensors, the VSS (6L3Z-9E731-A) in the top of the differential is the only source of rear wheel speed
The two sensors in the top of the trans are TSS (8C3Z-7M101-B)& OSS (8C3Z-7H103-C)not VSS
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I came up with 2 ABS codes and the ABS light came on, the codes were:
C1175 (Left Rear Wheel Speed Sensor Input Circuit Failure)
C1236 (Left Rear Wheel Speed Sensor Input Signal Missing)
It was dark and the driveway was wet so, given the codes and their definition it never crossed my mind that the truck wouldn't have a "Left Rear Wheel Speed Sensor".
No wonder I couldn't find a part number for this non-existent part.
I've dealt with these sensors with my 2000 Suburban. Took them out and cleaned them and they worked fine for about 6 months but in the end I ended up replacing them, they just get tired I supposed.
I figured I'd just get on the computer and order a new one and not have to worry in the future.
I guess the question now becomes: Are those two codes really telling me that the sensor on the differential is bad? Or could it be one of the sensors on the transmission?
I did have a situation on my way to the VA for an appointment last week where I noticed the tachometer jumped about 250rpm a couple times on level and straight road driving. It seemed to have no effect on the feel of driving, not like it shifted down a gear then back but being on a flat road I may not have noticed that happening and it had no effect on the speedometer.
Not to nit-pick but the Ford Service Manual lists the Sensor on the rear differential as a "Wheel Speed Sensor" (see PDF), it also lists the front left and right as "Wheel Speed Sensors". For clarity for others that may be researching what sensor is indicated by those codes would you please state if the sensor on the differential is in fact the VSS and how you know that?
You may be a Sr Master Tech, I have no way of knowing where your info comes from. Not trying to put you on the spot but I'd like to know and I'd like readers of this thread to know statements made are fact not what someone "believes to be fact".