battery disconnect/ computer relearn | Toyota Nation Forum
Aug 08, 2011 · I've heard that a lot too... many people saying the ECU has to 'relearn'. Rather than just calling it a myth, though, I think it at least has a grain of truth. After resetting DTC's, which happens when the battery is disconnected for a while, the ECU has to figure out if some of the emissions control sensors are working correctly, once it has figured that out it sets some flags that say 'ready for inspection'.
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