How much should I drive a 2003 Toyota Corolla to get the readiness code active again?

I had a check engine light (code p420) and my mechanic said it will cost $1200 to change the catalytic converter but usually this is casued by a defective oxygen sensor.



I learned through some research that if I disconnect the battery and connect it back, the check engine light disappears (it did). When I took the car for emissions testing diagnosis I learned that my car was not ready to throw out a report as it was not driven long enough after the battery disconnection and it should be, before the %26quot;readiness code%26quot; is reset.



My question: How much should I drive before the emissions can read from my car computer? There is no check engine light right now but if I drive too long, it might come back, so what is the range of miles/speeds that I should drive?



Readers who have especially had experience with a Toyota Corolla can add more value to this question.



Thanks guys!How much should I drive a 2003 Toyota Corolla to get the readiness code active again?Best if let car sit overnight,cold engine,with half full gas tank,start and let it warm up like 10 minutes,with AC on,then drive nice and easy local and highway speed,best when there is no or very light traffic.Whenever have to stop,leave engine idling until finish,all monitor should run within half an hour,anything no good will show up by the check engine light,or all system ready or completed.How much should I drive a 2003 Toyota Corolla to get the readiness code active again?I think you drive it for 40-50 miles before it can reset itself.How much should I drive a 2003 Toyota Corolla to get the readiness code active again?drive at speed 80 to 90 km /h for 45km