I had the same problem like that .
I would also like to share my the scariest driving experience, here.
My car is 05 XLS, after 2 years normal driving. I find out my car starts to oil leak in somewhere(on that time we dont know where that is)Since the oil continue to drip on my garage. More worsely,oil sucks into my timming belt, then, it cause my engine have some scrachy noise(between the belt and the bearing wheel) when the engine TURN OFF.(WTH) So I dont really think that is the problem, so I continue my driving as usual.
But one day, after I finish the replacement of the "assembly", the NIGHTMARE finally towards to me. When I was driving on the avenue and trying to have right turn to residental st. All in sudden, it was like the steering wheel being frozen, CAN NOT TURN!! On that moment, I felt myself so lucky, cuz I was only on the residental interception, not in the high-volume traffic interception. Finally, The Buster was comming, the guy open the hood, he found out the belt had been off the bearing wheel. The reason of that , is simple and easy , Why it comes off without any omens?
CUZ THE OIL FULLY SUCKS INTO THE TIMMING BELT. it lubricated the surface.
The timming belt will cause you NO POWER STEERING, BATTERY CHARGING.
Volks,here is my some personal advise for everyone that is owning 05 Avalon, carefully check your timming belt after your Oil Pipe Assembly replacement. and check :Dose the car has the same werid sound when the engine turns off ? If so, replace your timming belt as soon as possible, (LIFE GUARANTEE!!)This incident make me know that Toyota would make some REAL LEMMON CAR ,EVEN IT's a Top selling manufacture.