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How many miles do I need to drive to get the Catalyst monitor ready for smog test?

My car<1997, Toyota, Corolla> failed smog test a month ago and an auto repair shop did fixing and cost me $550. And I went to the smog test only center again, but I was told to drive 100 miles to get car ready for the test. After driving 200 miles, today I went back to the smog test only center, but I was told to drive 100 miles more because the Catalyst monitor is still not ready.

I need to know how many miles do I need to drive to get the Catalyst monitor ready for smog test.

Thanks very much for your time and attention!!

@GreenLover2012
You may get the answer you need here, but if not, you might do better posting in another section on this forum which suits your post more precisely. Go to the top of this page, find “Topic Index” and select “Repair and Maintenance”. Once there, look for the same red box to click for asking questions. You’ll get excellent advice there, lots of activity in that section. Good question though!