Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2021 Kia Niro Plug-In Hybrid EXFACTORY OEM SERVICE PROCEDURE

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.

Courtesy of KIA MOTORS AMERICA, INC.

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.

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