2013 Lexus RX 330 throttle position sensor

You don't have a simple throttle position sensor. You have a very complicated and dangerous "throttle-by-wire" system that replaces a very reliable throttle cable with an unreliable computer and multiple sensors. When we had just the throttle position sensor, a failure was detected by the Engine Computer, and it would set a diagnostic fault code. Hard failures were very easy to confirm with a few resistance checks. For intermittent failures that were hard to catch, the Engine Computer did that for us. With your system there is a lot more complexity, and most repairs are very expensive. Some shops won't work on them for fear of potential lawsuits. That will likely change in the future when the common problems become more well-known.