On my 2008 Hyundai Accent. The passenger side has the speed sensor rusted into the knuckle. Any tips other than let it soak? Plastic senor seems to be rusted in place.
Let it soak as much as possible. Also use a wire brush to get some of the rust off the nut. I had one of those bolt heads snap off on a 98 Sienna. Had to drill it out a few months later when the sensor died.
If you need to get the knuckle off the car there is probably a wiring harness under the plastic of the wheel well that can be unclipped.