My RX350 won't turn over. I replaced the key fob and main battery the other day and the engine finally turned over. I drove it Thursday, it hesitated on starting Sunday but after a few tries it started....Went to go out today (Monday) and it sounds like it's going to start but the engine will not turnover. I did notice that there is a red light on the silver ring my around my start button but the indicator light is green like it usually is when I start it. What does the red light mean? Any suggestions before I have it towed to a dealer?

 

I doubt it is anything you can fix. It could be any number of things, fuel system, or any number of components, and there may be stored codes. You need to run more sophisticated diagnostics and not be on the learning curve at the same time. Have a pro take a look.
If you are in Montgomery or PG County you could consider taking it to Satellite Motors in Silver Spring instead of the dealer. They are an independent Toyota specialist and will be more honest and less expensive than the dealer with great reviews online. I have friends in Maryland who use them.
http://satellitemotors.com/

 

Sometimes words can throw the reader off.

crank/Turnover --> fails to spin. [Battery, terminals, starter]
fails to Catch -> Does not run [engine and not the wheels] [imobilizer, fuel, air, spark, timing] Since the engine turnsover/crank, it may give you CEL to help diagnose.

Salim