I too have had issues with my Sienna's engine light, TRAC light, and VCS light coming on. It does not happen until I get to 85 or higher in my van. I live in Germany and have taken the car to a Toyota dealership and am told they can't do anything about it because I didn't purchase my vehicle with them. They just turn the lights off and say everything is ok. However I took my van in to the base and had the mechanics look at it and they say my cylinders 1 through 6 are not fire starting properly. I think it is something to do with fuel because I notice that ever since we had the vehicle shipped here our van will guzzle through gas like nothing...and this is not when driving on the autobahn. This is just driving 17k to and from post. So what is the deal. Is it my fuel injection system or is it my spark plugs, because the lights come on and van runs smooth and nothing happens. However if I hit that 90mph mark engine light blinks and van slows down, which makes me believe this is the governor in the car kicking in. Anyone have a clue as to what it might be?