I dont drive the car in winter, bettery went dead, now charged, didn't remove battery to charge it. How to reset computer in order to have state e-test done. Happen last year, had to bring to Lexus dealer to reset, cost $250.00. I would like to avoid this very large bill this yesr. Heard I can do it myself, how can I reset the computer?

The transmission will not go into overdrive. There is no button to turn the overdrive on and off.The overdrive worked fine after i first got the car with about 108,000 miles on it but after the car sat for over a year woth out using it the overdrive stoped working. I put a new fillter and fuid in but still won't work. Wha would be the most likely trouble,TCM ECM ECU or the Overdrive Solenoide.
Thank you.

there doesnt seem to be any off/on switch on the shifter on any other place on the car.the when the shift is in the D spot it looks like it should go into overdriveas to info in the owners manual but at 60 miles per hour the at almost 2600 RPMs but no shifting into overdrive.