Between the air filter housing and the throttle body in the air inlet duct. It is the next thing in line after the air filter and it will have a 3 or 4 wire connector plugged into it.If you take it out you can clean the 3 elements in it with a carb cleaner spray.(gently)don't touch them and make sure you put it back in facing the right direction for the air flow.
It's underneath the vehicle in the exhaust pipe after the cat convertor.
Computer
change your o2 sensor
it goes on/in the top of the gas tank
on my 2000 Chevy Venture, it's the one that sits pretty much on the top of the belt drive.
The knock sensor is located on the front of the engine, just above the oil filter mount. It should have a single Dark Blue wire connected to it.
fuel shut off sensor located on Chevy Malibu
Its located underneath the van in the rear.
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I've got a better question, why is this question in the Chevy venture forum ?
The fuse diagram for a 2000 Chevy Venture is located inside the car owner's manual. The diagram is also available at various auto part stores.
The oxygen sensors on a 2000 Chevrolet Venture are located on the catalytic convertor. There are 2 of them. One is at the head of the convertor and the other is aft.