I can't tell you for sure for your vehicle model, but on mine the sensor
is a notched wheel (looks like a gear) and a magnetic pickup the detects
It's right near the wheel, should be easy to see. The first thing to
check is if the notches are all clear and distinct, otherwise the pickup
doesn't get a clear signal.
Since the pickup is magnetic it attracts various junk, so try cleaning it.
If the problem is the pickup, it easy to change but quite expensive for
the part. If it's the wheel (doubtful - just clean the notches) then
it's quite difficult or expensive to replace since it's basically the
entire wheel hub/bearings (depending on if you try to remove the wheel
from the hub, or just replace the whole thing).
Keep in mind I don't know about your model specifically.
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