"Knock" when turning to the right

I've recently noticed (within the last 3 months) a progressive "knock" when turning to the right with my 2000 Quest SE. I just took the car in for a recall for steering rack bolts not being torqued down. The delaer acknowledges when test driving the van that there is a mild knock but that it is not related to this recall.
Anyway, I bought this thing in February 200 0and love it except for this problem. The dealer implied that if they tear into the van, I may be liable for expenses if nothing is found. Does anyone have some advice on this issue?

Thanks.

my parents have a 2000 Quest no knock

but their 1995 Quest had a knock like that, it was the CV joints, they had rotted away have them checked see what happens

good luck