How long does the computer take to "register" a new catalytic converter?

Anyone have any ideas? Should I reset the comp now that the new part has been installed? My truck is an '01 2.7L Prerunner. sorry, not sure if the 4-banger section is best for this or not

 

if my understanding is correct, reset the computer by unplugging the negative terminal of the battery for 15 min or so and the computer will recallibrate with in a few times of using it, if not by the first time

 

You don't have to do anything..... it'll relearn itself.

 

thanks for the replies, but i'm good to go now. after driving about 15 miles to the emissions test center, i passed smog. so all is well now

 

Instantly. Unless of course the check engine light is on with a P0420 code, which in that case you might want to pull off the ground cable from the battery or clear the code with a scanner real quick.

 

Some of the monitors take a few days to pass, depending on your driving conditions. Resetting the ECU right before going to the emissions check, and they won't pass you. Plan accordingly.

 

Yeah, this right here. If you're replacing a cat for smog failure reasons make sure the station at least checks the monitors for you to make sure they are all clear before you run it and they fail you for that.