How many O2 sensors does a 2000 Chevy Silverado z71 have?

A 2000 Chevy Silverado Z71 typically has one O2 sensor per catalytic converter. Since it has two catalytic converters (one for each bank of cylinders), it usually has two O2 sensors. However, it's *possible* to have more depending on the specific engine and emissions configuration. To be absolutely certain, you should check your owner's manual or a repair manual specific to your truck's engine.