The alternator acts as the belt tensioner.
Look in PAGE 500 of the Owner's Manual
below the exhaust pipe, look like a a rectagular shape, remove the two bolts, clean then use RTV high temp selant.
The cast of Look at Me - 2013 includes: Sienna Beckman as The Robot James Giordano as Skip John Kenower as Dr. Howard Pile
Look in your owner's manual.
Look under the vehicle along frame - follow the fuel line from the tank
The best place to find aftermarket floor mats for a Toyota Sienna would be at an auto parts store that sells car accessories, such as Canadian Tire. One could also look at auto supply store sites, and at Amazon.
The oil filter on the 2006 Toyota Sienna is in the front, pointing toward the front under the exhaust manifold. As you look under the hood from the front, it is in the center directly under the exhaust manifold.
The spare tire release bolt is located in the rear cargo area of the 1998 Toyota Sienna. Look for a small "U" shaped piece of loose carpet on the floor of the cargo area. The bolt should be turned counterclockwise to release the spare tire.
Toyota sienna radios have the aux or disc button on the radio, they also have the plug for the auxiliary audio input interface behind the Toyota radio but it is not in the vehicle the audio input interface needs to install into the vehicle, depending on the year of your vehicle if older you need the toy-aux or if newer Toyota you will need the toy03-aux this are the Toyota audio input interface part numbers, or you can go to yahoo search and look for ( Toyota auxiliary input )
It is located underneath the steering column. You have to lay on your back in order to look up at it with your head near the pedals.
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.