OkNot sure if your Sentra ECU is similar to our Xtrail ECU but being Nissans around the same period it could be.
To reset our ECU all we have to do with the engine turned off at operating temp is pull 3 fuses. ENG CONT1, ENG CONT2, ENG CONT3 and leave things for 5 minutes. Then put the fuses back in, start the car and let it idle for another 5 minutes to relearn without touching the accelerator then turn off the engine.
I find this easier as it won't throw any codes which might cause other problems if unable to clear. It is the same as disconnecting your battery but without having to enter the radio security code.
You could check if you have the same 3 fuses in the engine bay fuse box.
Will check the engine bay for the those fuses then
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