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In a 2004 Kia Rio, you can find the speed sensor on the driver's side connected to the transmission. When this sensor starts to go bad, it can directly impact how the automatic transmission functions. A key indicator of a faulty speed sensor is unusual automatic transmission behavior, like delayed or rough shifting, as well as restricted gear changes. If this sensor is not working properly, it could compromise your ability to drive safely. The speed sensor is vulnerable to damage or cracking, and the plastic part might become brittle after being exposed to the elements for a long time. The magnetic section of the sensor could also wear out or sustain damage over the years.
The speed sensor for the 2004 Kia Rio can be found on the transmission output shaft.