Well, You bought a Lexus for it's quality and dependability among other reasons I am sure...Buy OEM parts and have a piece of mind that is not made in china...Sleep well 😉
OK, First check the battery in the fob to make sure it is good, Now if it is good (new) Disconnect the neg. battery terminal for 10 minutes...Reconnect and start the car,,,
If you are having questions and want facts, Call a Lexus Parts department and verify the parts you need and there part numbers and cost. Then you can research for a better price.
Straight forward job, One bolt to remove the sensor from the wheel hub, Follow the wire back to connector, Disconnect and reverse the procedure to install.