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replace oxygen sensor on the left bank(side towards front of car) it is located on the exhaust manifold staring you in face when hood is open Read more: Toyota Highlander Limited what does trouble code p1150 on - JustAnswer http://www.justanswer.com/toyota/490ow-toyota-highlander-limited-does-trouble-code-p1150.html#ixzz1T8tewlwW
In my 2004 Sienna there was a weld in the door assembly that broke and caused a loud clunking noise when I opened the door. Toyota recently issued a recall for this problem and will fix it free of charge
You probably put an O2 sensor where you should have an Air ratio sensor, they are different they only look similar but they are different internally.
fix the vacuum leak
The following link has instructions, diagrams and pictures showing how to make this repair easily and inexpensively: http://www.findonefindall.com/toyota-sienna/siennareardoor.htm
To fix a Toyota Sienna driver's side seat belt that is stuck, you might need to pull the entire belt out slowly until it is completely extended. Then, allow the belt to retract slowly.
We have a fix for this problem that anyone can do - includes testimonials! http://www.findonefindall.com/toyota-sienna/index.htm See full details under "How do I replace the passenger side mirror on 2000 Toyota Sienna?
check your altenator and fix it..but before that go to auto zone store is free to check up your engine light, alternator, battery and starter..
http://www.findonefindall.com/toyota-sienna/siennareardoor.htm Works like a charm. I spent $497.00 getting my 1999 Sienna handle fixed at the dealer, less than 2 yrs later it broke again. This fix took less than 30 mins and cost pennies.
It seems that you need new tires.
How To Fix vsc,trac off and engine light on for 2009 Toyota Sienna
Get a new car................ -___-