April 5, 2026: LEMON Manuals is launched! Read the announcement.

[2nd Method]

NOTE:

The 2nd method should be performed only if the 1st method fails (the misfire-related codes recur).

Start the engine and keep the engine running at idle for 2 minutes.
Drive the vehicle for over 20 minutes, keeping the engine speed above 3500 RPM.

NOTE:

If equipped with manual transaxle, shift the gear properly for keeping the engine speed above 3500 RPM.

Fig 1: Engine Speed Timing Pattern

G12273560

Courtesy of KIA MOTORS AMERICA, INC.

Removal

NOTE:

Be careful that no contaminant enters into spark plug holes.
Use the spark plug wrench (A) to prevent the damage on the spark plug.

Fig 2: Preventing Contamination Spark Plug Using Spark Plug Wrench
Courtesy of KIA MOTORS AMERICA, INC.

NOTE:

When removing the ignition coil connector, pull the lock pin (A) and push the clip (B).

Fig 3: Locating Lock Pin & Coil Connector
Courtesy of KIA MOTORS AMERICA, INC.