[1st Method]

Start the engine and keep the engine running at idle for 2 minutes.
Step on the accelerator pedal and hold it steady at 4500 rpm with the shift lever in N position to warm up the engine until the temperature of the engine coolant reaches 80°C.
Keep the engine running at 2500~3000 rpm in the N position for 15 minutes.

Fig 1: Engine Speed Graph (First Method)
Courtesy of HYUNDAI MOTOR AMERICA

[2nd Method]
NOTE:
- The 2nd method should be performed only if the 1st method fails (the misfire-related codes recur).
1. Start the engine and keep the engine running at idle for 2 minutes.
2. Drive the vehicle for over 20 minutes, keeping the engine speed above 3500 rpm.
  NOTE:
  - If equipped with manual transaxle, shift the gear properly to keep the engine speed above 3500 rpm.
  Fig 2: Engine Speed Graph (Second Method)
  Courtesy of HYUNDAI MOTOR AMERICA