what cause an o/d light to start flashing on a 03 Ford Focus se ? on 2003 Ford Focus

I just got my 03 Ford Focus few wks agao. It was running fine ! But then I drove for a 3hr drive on highway and out of no wheres the o/d light starts to flash. I couldnt stop because I was on the highway, but when I press the od button it stop. But now the car runs strange not as smooth. All the shiftin gear is fine.

by in Keene, NH on March 18, 2013
3 answers 1 comment
ANSWER by , March 18, 2013
One of the first places to start would be with the transmission fluid. Its level, primarily. If the level is ok (test when fluid is hot; usually a 20 minute drive) then further diagnosis or changing the fluid yourself would be the next step.
ANSWER by , March 18, 2013
ther are trans codes,scan and post so we can adv or seek freee insp from aamco then post findings
ANSWER by , April 05, 2013
I have an '04 that's had the same problem except it was shifting hard from 1st to 2nd gear, also the electrical system would cut out and cause what I can describe as a stall. Voltage on alternator checked and found to be within range however the resistance was WAY too high for a low-voltage power system. Replaced entire negative battery wire/clamp and the battery itself. Ran a second ground from the negative battery terminal to the car's frame. Drove the car @ 45mph for 3 min without stopping (may be hard depending on where you live) to let it reset the oxygen sensors and whatnot. ALL problems have ceased. Good luck!
COMMENT by , April 05, 2013
Yes that was my same problem. I brought it to the dealer. They couldnt figure out what was wrong ! Then finally they realize it was ground