I've had a problem for a while with my SUV. It's a 2002 Ford Explorer XLT 2WD. It seems to drive without issue. Between about 2-11 miles worth of driving, the 'O/D OFF' lamp begins flashing steadily. It will continue flashing until the car is turned off. The 'Service Engine' lamp does not come on. When you start the car again, the 'O/D OFF' lamp is not lit.
I hooked up an ODBII reader and was able to get some information from it. It gave me code P1151, and this was the only code it gave me. I am concerned that the presence of this code will not allow me to pass a smog check (California). My ODBII reader also gave me some extra information relating to that code -- I can provide if it is useful.
What do you think it might be? What should be my first step in further diagnosing and repairing this issue? I am not very experienced when it comes to cars but I am willing to give it a shot.
Thank you for any assistance you may be able to provide!!