2nd Method

WARNING: This page is about a different car, the 2021 Kia Soul. However, it is still accessible from the selected car via links, so may be relevant.

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.
Courtesy of KIA MOTORS AMERICA, INC.