I dirve a Nissan 200sx SE-R. My check engine light came on today and I have no clue why. Car is not acting funny at all, it shifted wierd about twice this week while driving up the hill out of my neighborhood, it shifted to third and didnt downshift till I put it in second, when it usual goes to second (auto, don't laugh) but thats about it. Fluids are all good. Anyone have any ideas?

Check the code http://www.se-r.net/engine/ecu_codes.html and let us know what code showed up.

Thanks, When I make the lunch run for work I will check that out and post.

HOW do I get ot this screw?? All I see the is the hard plastic covering, hiding the ECU

To get to mine I took out the plastic dash piece in the very back. Then there are I think 4 screws holding the ecu in a bracket. Take those out and then twist the ecu and you can see the screw.

okthanks

Ok, I took out the ecu you , checked it and everything, here is what I got

1103: A/T first signal : Have vehicle diagnosed by dealer service department or other qualified repair shop.

After you check the code, when you turn the screw clockwise, counter-clockwise, that takes you out of diag. mode. That should have cleared the code also. I won't worry about it, unless the code came back.

thanks for all the help

that happened to me the other day and my car ran fine. It had 28k miles on it. all i did was changed the transmission fluid and oil and the light was gone.