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Re: 2002 Kia Sedona XL suddenly downshifts
What was the codes exactly that Auto Zone gave you.??? it might just be a simple wire harness that may have gone loose since you did some work on the speed sensor.
Here are the trouble codes for your car.
Good Luck and get the car scanned again for a more define information.
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looking from above you need to remove the air filter housing to make life simple. look down the back over the starter motor and you will see the diff housing with the sensor just on the top. from underneath you wont see it but its easy to feel.
Sounds like either an input or an output shaft speed sensor. In a nut shell, the transmission's shifting is controlled electronically; at a stop or very slow speed, the transmission is automatically in first gear...when these sensors 'sense' that the vehicle is travelling at a certain speed, it tells the transmission to shift into second. At the next specified speed, it shifts into third; etc. etc. What it sounds like is that one of these sensors is going bad, telling the transmission to downshift, but the other sensor is fighting that command and causing the vehicle to 'act' like it's running rough, when in reality it's probably just the transmission rapidly jumping between gears. These sensors aren't particularly cheap, but are pretty easy to replace. Start by finding a shop that will plug in a code reader for you (or do it yourself if you have one). You're looking for a code in the range of 0715 to 0723. If it reads 0715 to 0718, that's the input side. 0720 to 0723 is the output side. Good luck.
For the record: if the sensors they're referring to are the input or output shaft speed sensors, they are very easy to find...just remove the air intake box (where the air filter is) and they're right there on top of the transmission. Input sensor is the one closer to the front of the vehicle, output towards the rear.
Sounds like the transmission is downshifting to passing gear. Might the electronic control module for the transmission. Have someone pull the codes from the computer, I'll bet there is one in there for the transmission.