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Where is the fuse for O2 sensor on a 1999 Chevy Tahoe?

The fuse for the O2 sensor on the 1999 Chevy Tahoe is located in the underhood fuse block, which is positioned in the engine bay on the driver's side of the vehicle. The specific fuse that you are looking for is labeled as "EFI 1" or "Engine Control 1." It is typically a 10 amp fuse.