Sienna transmission shifting issues

Whoa, sounds rough! I've got a Sienna too, and had similar craziness a while back. Was your issue constant, or did it come and go?

It's intermittent. Some days it's perfectly fine, others it turns into a total basket case. How was it in your case?

Yeah, sounds exactly like mine. It started intermittent, got worse quickly. Turned out the oil was totally worn. Get it to a workshop to have it checked; you really shouldn't drive like that.

I appreciate the insight. Took it to the shop; you nailed it – oil was shot. 240€ later, new oil in the transmission and she's shifting smooth as butter. Thanks again for the heads-up!