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I assume you mean low coolant light, If the coolant is low toppoff, if not smack the jug a few times (the floats hang from time to time, flush the system if coolant is nasty especially if you put the head on due to oil in coolant. O2 sounds like either the old sensor was used or contaiminated from chemicals (used during clean process) ir missfire.
Just a couple of places to start
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