Hello, I have a 2006 Sienna in almost immaculate condition that I'm selling after about 10 years. Amazing vehicle. The week I listed it, literally, it threw its first code which turned out to be a knock sensor failure. No knocking, just the damn sensor. With no time too spare I had to take it in to be fixed ($800 later!!!). It has been sitting in my driveway now for about a month without moving, and it is leaking coolant pretty bad. I've wiped it down from the bottom several times, but it's still coming out. Vicinity of the transmission. I need to arm myself with some knowledge before going back to the service station and giving them another $800. Anyone know where that leak might be coming from, following knock sensor 1 replacement? Thank you!