You can't shut off the test for the rear o2 catalyst. You have to disable all the codes that have to do with the catalyst emissions check and set them to no error report by removing the rear o2 sensor you're going to stop it from completing the test as long as it completes the test ( as long as its pass or fail it won't matter because it won't run again until you clear all the codes inside of the computer) it'll just reported that nothings wrong.
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