2000, RX300 216K miles, good service. AC failed, belt made huge noise, then turned off AC. Now vehicle will not shift into Overdrive, (4th Gear). Also getting a p0330 error for Knock Sensor. Already fixed O2 sensor. Also when AC failed, brakes started to go into Anti Lock mode but with no lights coming on. Did the slippage of the belt cause these other problems, and why would it not shift?

Over drive is very hard to feel just like in my mercedes parts (http://www.carpartswholesale.com/cpw/mercedes_benz-car-parts.html) and if you've got a 1500 to 2000 rpm drop but vehicle doesnt slow, then you are in overdrive, overdrive is like an assisted coast, for economy, you actually dont feel a boost in performance, like gears shifting.