Dude, what exactly do you want? If you have that drone at around 1200 RPM it has nothing to do with any sensors or fuel type. Its a crap design flaw they never caught during the design phase. My guess, most likely when they dropped the braided front pipe from previous models, probably to save a buck, is when this started, but it wont go away. So live with it or change it. There are several ways to try and cancel out the harmonic imbalance. Here is a thread that has another solution so maybe give this a try.
Hey all, With our growing family my wife and I purchased a new to us 16 Sienna XLE with 78K miles. The van is in pretty good condition and runs great. However there is an engine vibration at around 1,200 RPMs everytime it revs past it, slightly better when warm. I read a thread here about it...
At the end of the day, if you have drone its the harmonic imbalance between the engine and the exhaust creating matching sound waves bouncing off each other. Removing a bracket or adding a damper weight changes the frequencies and that is treating the cause, not the symptom.
If you have some other sort of problem not related to drone then take it to your dealer and ask them to fix it.