Hi:
There is a chance the sensor or the toner ring a is faulty. The easiest thing to do is this. When the wheel turns, in this case the left rear, it produces an electrical signal. Using a multi-meter, you can check if that is present. I've dealt with a lot of this failing. I'm not sure where you are located, but if you are where rust is an issue, that is usually the cause.
Here is a link that explains how to test one.
https://2carpros.com/articles/abs-wheel-speed-sensor-test/
If possible, follow that link and let us know the results.
Take care,
Joe
Sep 28, 2026 at 7:57 PM