Hello fellow members! I have most likely an easy question for you. I have an 04 Toyota Sienna that has been popping an a/f ratio sensor code since October of last year. The car ran fine and I just got around to replacing the sensor Saturday. It was not driven until today. I cleared the code and now the car hesitates a bit on acceleration. It most likely needs a fuel trim (not sure if that's the correct term) relearn. I'm going to clean the throttle body this weekend when I have time since that seems to be a recommendation from internet searches. It was running completely fine until the sensor replacement so that's why I think maybe it was running rich prior to the new sensor. So far no codes have shown up and it's been driven around 25 miles or so. It will be driven around 75 miles total by the end of today. My question is will this be something the computer relearns on it's own as is or should I disconnect the battery for a bit to reset everything and start from scratch?