My 2020 Chevrolet Blazer's fuel consumption recently skyrocketed for no apparent reason. I took it to the dealership, but they found nothing wrong. Later, using OBDocker's real-time data stream function, I discovered abnormal fluctuations in the oxygen sensor readings. The final diagnosis was a tiny crack and leak in the vacuum hose.
Replacing the hose cost only a few tens of dollars, and the fuel consumption immediately returned to normal. The biggest advantage of this tool is its ability to display "live data," which is far more accurate than simply reading fault codes, and it's particularly effective at fixing various "undetectable" problems.
Fellow car owners, have you encountered this kind of "false" fault? Welcome to share your experiences!

 

You would think a dealer would use a similar tool; hope they give you a refund for their work (funny, right?)