Replace the output speed sensor on the automatic transmission to restore proper speedometer operation and transmission shift control.

Warnings

Tools required

Parts

• Output speed sensor × 1 — Use OEM specification
• O-ring seal for sensor × 1 — Often included with sensor

Fluids

• Kia SP-IV-M ATF — 1 qt

Preparation

1. Park vehicle on level surface and apply parking brake
2. Allow transmission to cool if recently driven to avoid burns from hot fluid
3. Raise and support vehicle on jack stands if additional clearance is needed
4. Locate the output speed sensor on the transmission case near the right side axle output
5. Place drain pan under the sensor area to catch ATF during removal

Procedure

1. 1

   Disconnect electrical connector
   Locate the electrical connector on the output speed sensor. Press the release tab and pull the connector straight off the sensor. If corroded, gently work it free with a flathead screwdriver to avoid breaking the tab.
2. 2

   Remove sensor mounting bolt
   Using a 10mm socket and ratchet, remove the single bolt securing the output speed sensor to the transmission case. Keep the bolt for reinstallation if in good condition.
   Torque spec

   Sensor Bolts10 Nm (8 lb-ft)
3. 3

   Extract the sensor
   Carefully pull the sensor straight out of the transmission case. ATF will begin to drain immediately. Allow fluid to drain into the pan. If the sensor is stuck, gently twist while pulling to break the seal. Do not pry against the transmission case.
   ⚠Fluid may be warm. Expect approximately 0.5-1 quart of ATF to drain.
4. 4

   Inspect and clean mounting area
   Remove the old O-ring from the sensor bore if it remains in the transmission case. Clean the bore thoroughly with a shop towel to remove any debris or old seal material. Inspect for metal shavings which may indicate internal transmission damage.
5. 5

   Prepare new sensor
   Install the new O-ring onto the replacement sensor. Lightly coat the O-ring with clean ATF to aid installation and prevent tearing. Verify the sensor tip is clean and undamaged.
6. 6

   Install new sensor
   Insert the new sensor straight into the bore, ensuring the O-ring does not roll or pinch. Push firmly until the sensor seats completely and the mounting hole aligns with the threaded hole in the transmission case.
7. 7

   Install and torque mounting bolt
   Thread the mounting bolt by hand to avoid cross-threading. Using a torque wrench, tighten the bolt to specification. Do not overtighten as this can damage the sensor housing or transmission case threads.
   Torque spec

   Sensor Bolts10 Nm (8 lb-ft)
8. 8

   Reconnect electrical connector
   Push the electrical connector onto the sensor until it clicks into place. Tug gently to verify it is fully seated and locked.
9. 9

   Refill transmission fluid
   Locate the transmission dipstick or fill plug. Add Kia SP-IV-M ATF to replace the fluid lost during sensor removal, typically 0.5-1 quart. Use a funnel to avoid spills.
10. 10

    Check fluid level
    Start the engine and allow it to reach normal operating temperature. With the engine running and transmission in Park on level ground, check the fluid level using the dipstick. Add fluid as needed to reach the HOT range. Cycle through all gear positions and recheck level.

Reassembly

1. Lower vehicle from jack stands if raised
2. Wipe up any spilled ATF from transmission case and surrounding components
3. Dispose of used ATF according to local regulations

Verification

• Start the engine and verify no ATF leaks around the sensor
• Use a scan tool to confirm the output speed sensor is providing a signal
• Test drive the vehicle and verify speedometer operation is correct
• Verify transmission shifts smoothly through all gears without harsh engagements
• Recheck ATF level after test drive and top off if necessary

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