P0303 on KIA SPORTAGE — Cylinder 3 Misfire Detected

Q: "What does P0303 mean on a KIA SPORTAGE?"

"P0303 indicates: Cylinder 3 Misfire Detected. This is a ignition system code. 3 KIA SPORTAGE owners have reported this to NHTSA."

Q: "What are the most common causes of P0303 on KIA SPORTAGE?"

"Based on 3 NHTSA reports, the most commonly cited components are: Engine, Engine And Engine Cooling,Electronic Stability Control (Esc). These percentages are based on the component field in owner complaints."

Q: "Is P0303 serious on my KIA SPORTAGE?"

"Of 3 NHTSA reports for this code on KIA SPORTAGE, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic."

Q: "What should I do if my KIA SPORTAGE shows P0303?"

"1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare."

What P0303 Means on Your KIA SPORTAGE

P0303 is a diagnostic trouble code indicating: Cylinder 3 Misfire Detected. This code relates to the ignition system system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

3 KIA SPORTAGE owners have reported this issue to NHTSA across model years 2005-2018. Most reports come from the 2005, 2017 model years. The most commonly reported component is Engine (66.7% of reports).

Real KIA SPORTAGE Owner Reports

Source: NHTSA Complaints Database

"During all of the 5 incidents in 2009 the engine misfired violently. at times 35mph was max speed. cronin kia had my vehicle over 30 days in 5 visits in 2009. they have replaced; two cat. converters, the ignition coil pack and spark plugs, a leaking fuel injector and associated wiring."

— 2005 KIA SPORTAGE owner · ENGINE AND ENGINE COOLING,ELECTRONIC STABILITY CONTROL (ESC) · Filed 03/07/2009

"Engine failed on the highway. Car is part of the class action lawsuit but dealer is refusing to replace engine for free. Asking me to pay $7k. Claiming that DTC is reading P0303."

— 2017 KIA SPORTAGE owner · ENGINE · Filed 02/03/2024

"Code P0303. Took car to dealer for diagnosis, dealer recommended long engine block replacement due to bad pistons. Kia will not replace. Car has 68K miles on it. Called Kia and they will not even do a goodwill replacement."

— 2018 KIA SPORTAGE owner · ENGINE · Filed 07/01/2024

All reports filed by vehicle owners directly with the U.S. Department of Transportation.

📊 Complaint Trend by Model Year

1

'05

1

'17

1

'18

Common Causes on KIA SPORTAGE

Based on NHTSA complaint component analysis for this vehicle.

ENGINE 66.7%

ENGINE and ENGINE COOLING,ELECTRONIC STABILITY CONTROL (ESC) 33.3%

What To Do Next

1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
2
Get a proper diagnosis
A code alone doesn't tell you the exact failed part. A diagnostic at a shop ($50–$150) pinpoints the root cause before you spend money on parts.
3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.

Frequently Asked Questions

What does P0303 mean on a KIA SPORTAGE? ▾

P0303 indicates: Cylinder 3 Misfire Detected. This is a ignition system code. 3 KIA SPORTAGE owners have reported this to NHTSA.

What are the most common causes of P0303 on KIA SPORTAGE? ▾

Based on 3 NHTSA reports, the most commonly cited components are: Engine, Engine And Engine Cooling,Electronic Stability Control (Esc). These percentages are based on the component field in owner complaints.

Is P0303 serious on my KIA SPORTAGE? ▾

Of 3 NHTSA reports for this code on KIA SPORTAGE, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic.

What should I do if my KIA SPORTAGE shows P0303? ▾

1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare.