The cheapest solution would be to replace the sensor on your own.
This may or may not cause a problem with accurately measuring and determining your brake pad wear, however. You are going to be close to pads anyway, I think front pads are around 50-60k miles, rears are about 8-10k after that. May want to just go ahead and do pads, rotors, sensor and make sure your CBS is reset as well and not worry about it again until your close to 100k miles.
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