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Trying to learn monitors for inspection have catalytic , O2 senser ,O2 heater

(1997 Cadillac Seville STS)
in Springville, NY on October 03, 2013
have driven for over a week 250 miles or more wont learn those three monitors any tricks? we replaced egr valve now no check engine light and drove with scanner on, O2 readings for all 4 sensers appear good
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