Your average home car code reader won't tell you anything about that it, will be one of the Wheel hubs sensors or bearings, in which case the hub assembly will have to be replaced unless your harness or plug came loose on it. Most likely its the bad bearing doing it if you hear the grinding noise already. The lights don't always come on when you hear a bad bearing. Hopefully you choose the right side when you replace it! I would suggest jacking each side up and spinning the wheel to see which side is noisier.
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