Which "speed sensor" did you replace? And are you sure there are no ABS codes stored in the ECU?

 

It was the transmission output sensor ( plastic magnetic sensor) and no abs codes but I have a cheep scanner

 

Duralast Vehicle/Transmission Speed Sensor SU1528

 

Ok, your original trans speed output sensor was probably not at fault. Since the ABS and Traction Control dash lights are on, there must be a trouble code indicating that one of the rear ABS wheel speed sensors has a problem. You need to see if you can have the trouble code read for you with a better OBDII reader. That code will tell you which side of your FJ has the faulty ABS sensor and/or a wiring problem to that sensor. Then we can work from there.

What year FJ and do you remember the mileage before the odometer went blank?

 

Its a 2011 with 350,000 miles. I will work on the scanner issue today. Thanks

 

Really? That puts you in the very high mileage class for FJ's. Wow!

Let us know what codes you find. I'm betting one of the rear ABS sensors, or it's wiring/connector, are at fault.

 

Code reader at the parts only showed bad sensor. Did not indicate left or right, front or back. I'm just going to start testing wires and sensors

 

I'm going to suggest that a front wheel ABS sensor is more likely to fail than a rear.

At 350K miles, have you checked both front wheel bearings for play or looseness? The magnetic encoder ring for the wheel speed sensors is an integral part of the wheel bearing, and any defect in the bearing can affect the spacing of the encoder to the sensor.

Also, has there been any recent work done on the front suspension? The extension cable between the front sensors and the main wiring harness can easily be damaged if it gets stretched or stressed during suspension work, if a tree branch gets caught up between a front wheel and the suspension, etc.

 

Auto or manual? I think they pick up speed readings from different locations, manual is from back of T case I think?

I had a broken wire to the rear diff and that caused all the issues described above, on my automatic FJ.