thanks alot for the tips, i didn't know that the tranny stores codes... i've since reset the computer though, having changed my O2 sensor. The first time this happened my O/D off light was flashing.. but the last couple of trips i've taken it hasn't set off the blinking light. I think because i knew there was a problem so i was stopping frequently to give the transaxle a break. I'll get it scanned at my earlier convenience, hopefully that will give me an idea, but i think resetting the computer after changing my O2 would have cleared those codes.
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