Has anyone encountered an ECU going bad? I have a '99 Accord LX I4 and the shop I brought it to said my ECU might be bad. Shifting weird lately on me going into 3rd and 4th gear. At first I thought it was the transmission but my mechanic also a close friend said the reason why it's shifting in and out of gear on 3rd and 4th is because the ECU doesn't know what gear it's in so the computer locked out gears 3 an 4. It shifts fine going into 1st and 2nd. I checked the transmission fluid and it's fine. It's been changed twice at 30K and 60K. My mechanic says it might be a bad ECU, bad sensors, or may be even the tranny, I personally think it'sthe tranny. He's currently working on the car as we speak at his shop so we'll find out. If anyone has had this problem or may know what the problem is your input would be greatly appreciated.