So I have a right rear ABS sensor issue on my truck I swapped the sensor and a day later the fault came back. My question is this does there the sensor connect to the hub. Is it supposed to have gear oil in it when the sensor was replaced by the mechanic who works on all makes and models jack of all trades oil was leaking from the area when the sensor was replaced on the RR wheel. If the ABS sensor is not the issue is there a separate part to try to replace. I am hoping the the cog that the sensor reads off can be replaced separately instead of a who Axel. Thanks in advance.