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No it's not in my 'bu but I just changed the upstream sensors in my 5.3 Tahoe that has 101k miles on it. Changed plugs at 80k and they looked like new, preventative maintenance. Fuel mileage has been dropping slowly so now I decided to try the O2 sensors. Of course I did the dragging brakes check, etc. . Now with the new upstream sensors in my avg. mileage on the dash has increased 1.6 to 1.9 mpg over the last 1000 miles. This has been over 4 trips to go snowmobiling over the same route running 5 mph over the posted limit in a mix of highway and 2 lane state roads. Old sensors scanned fine and looked fine, no codes. In a thirsty vehicle I think that's a big improvement so now my maintenance routine will be to change O2 sensors with my usual 80k plug changes in all my vehicles.
Disclaimer, your mileage may vary.....
 
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