I purchase a new 2011 Sienna Limited AWD a month ago...and a few days after receiving it, I noticed a clunking noise/feeling in the steering wheel when turning both left and right. It usually happens when making hard turns where I can roll through the turn and not have to stop or slow down significantly (like at a stop sign). Anyway, I took into the dealership and the mechanic said it was a problem with the intermediate steering shaft. They will replace it under the warranty (now waiting for parts). He said he has not heard of the third generation Sienna's having this problem...and I hadn't seen anybody post anything about the problem with 2011/2012's. So thought I'd give 3rd gen owners a head's up.