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It sometimes takes as long as 2 hours +. I have seen in the older 165 ECM which covers 86 thru 89 cars, with a 02 sensor disconnected to take over 2 hours to throw a code 13. Why, I have no idea. Try that with a later 94 and up PCM and you will get a code nearly as soon as you disconnect the wire. I think it has to do with the strategies, and the comm rates within the ECM.
