2009 F-150 FX4 SuperCrew 4X4 5.4L

My ABS and stability control lights are on. I had the codes pulled today (listed in order):

1) C1298 (Right Rear Wheel Speed Sensor Input Signal Fault)
2) C1165 (Right Rear Wheel Speed Sensor Input Circuit Failure)
3) C1963 (Stability Control Inhibit Warning)
4) C1299 (Left Rear Wheel Speed Sensor Input Signal Fault)
5) C1175 (Left Rear Wheel Speed Sensor Input Circuit Failure)

I'll ignore the stability control code for now since I'm sure it is tied to the speed sensor errors. Anyways, I decided to inspect the rear wheels and I found this sucker just hanging beneath the right rear brake caliper:



Is this a speed sensor? Where does it plug into? Diagrams would be extremely helpful!

I am planning on ordering 2 new sensors for each rear wheel but I don't know where to begin. Any help would be appreciated!

 

It is hard to make out much from your photo. That could be a speed sensor, and if it is then it is definitely broken. The sensor itself is affixed with an M6 bolt (10 mm head).

The rear speed sensors are mounted on each side's brake backing plate. The left side has a short run of wire to its connector on a bracket. Follow the rear diff vent line to locate the bracket. The right side sensor has a much longer wire which contours the top of the rear differential cover and terminates on the same bracket as the left one.

The odds of both speed sensors going bad at the exact same time are pretty darn slim - but crazier things have happened. And unless you're driving where you shouldn't then the chance of smacking around both sensors concurrently is slim. If your ABS warning just illuminated then you like have a wiring issue. (The exception to this is if the ABS lamp has been illuminated for a long time due to one side screwing up, and between the initial fault and today when the codes were pulled the other side was also damaged. )

Check the connectors on the bracket where the speed sensors plug in. Also have a very, very good look at the main harness which runs along the left side of the frame rail in big wiring loom. I have made a lot of money over the years fixing that harness. Sand, mud and gravel likes to get inside the loom and eat away the wiring - most commonly at the front where it swings down from the ABS module area (right behind the l/front tire) and at the rear where it swings up right before the l/rear tire.

Happy hunting.

 

The truck was used on the farm, and there was tons of dirt and sand accumulated everywhere. The ABS light has been on for a very long time.

I will check all connections. Thanks so much for the reply!

 

Update: ABS light is off after replacing both rear axle speed sensors (part #: BRAB-282 & BRAB-283). Got them both from amazon for $40 each.