Wheel speed sensor issue

So, has anyone seen this before? Had the infamous gear oil on the sensor problem. Found a bad diff vent. Replaced the vent, cleaned out the oil from the backside (sensor side) of the bearing, the sensor, installed a new wheel seal just in case, and now everything went pear shaped. It throws no codes, but locks out the accelerator, flashes the trac light, and screws with the brake operation. Snapon scanner only shows the variation for speed on live data and there is no oil on the sensor. All the wires and connectors are clean and not damaged or exposed. I did axle bearings last year and used aftermarket replacements. Since the tone rings are internal on the bearings, I can't check for metal debris. What am I missing? I had this oil issue before and it worked fine after I cleaned everything out. Had I replaced the vent then, it wouldn't have happened again

 

Do you see that one wheel speed sensor reading differently than the other three?

I can't remember, but you could try swapping the left and right sensors to see if the problem follows a sensor.

Those buggers are pricey enough that I'd want to be really certain before buying a new one!

 

Well, there's the rub. It is a new sensor. The old one did the same thing. And they can only swap front to rear. Side to side are different. The only thing I can think of is the replacement bearing let go and there is gear oil and debris inside on the tone ring and thats what is screwing the system up. As for swapping, tried it. Same result

 

I would jack the rear axle off the ground and observe the wheel speed data for each rear wheel and turn it by hand. If you get a hiccup in the same spot on every rotation, then you'll need to at least pull the axle and see what's going on in there.

If you did the rear wheel bearings recently, this should not be a particularly intimidating task. Other than getting the parking brake shoes back on properly, it's relatively easy.