What Does P0172 Mean on Your 2022 Kia Sportage?
When your 2022 Kia Sportage triggers a P0172 code, the engine control module has found that the engine is running too rich. The redesigned 2022 Sportage uses a 2.5-liter Smartstream inline-4 engine producing 187 horsepower. As an inline-4 with one bank, P0172 means the entire engine is receiving excess fuel. The ECM adjusts fuel delivery using oxygen sensor feedback, and when corrections cannot bring the mixture into normal range, this code is set.
Symptoms You Might Notice
- Check engine light on
- Fuel economy below the rated 29 mpg combined
- Black or dark exhaust smoke
- Rough idle or vibration
- Hesitation during acceleration
- Fuel smell from the exhaust
Common Causes of P0172 on the 2022 Sportage
- Dirty MAF Sensor — Contamination on the mass airflow sensor is the most common cause, leading to inaccurate readings and over-fueling.
- Stuck Open EVAP Purge Valve — A well-known Kia issue. The purge valve fails open, continuously allowing fuel vapors into the intake manifold.
- Worn Oxygen Sensor — After a few years, the upstream O2 sensor may degrade, providing slow or inaccurate feedback.
- Fuel Pressure Issue — A malfunctioning fuel pressure regulator can cause excess fuel delivery.
How to Diagnose the Problem
- Scan for companion codes — EVAP codes alongside P0172 point to a purge valve issue.
- Check fuel trims — LTFT below -10% confirms the rich condition.
- Clean the MAF sensor — At idle, expect about 4-9 g/s for the 2.5L. Use MAF-specific cleaner.
- Test the purge valve — Disconnect and plug the purge line. If trims improve, replace the valve.
- Verify fuel pressure — Check against factory specifications.
Repair Options and Estimated Costs
- MAF sensor cleaning — $10-$25 (easy DIY)
- MAF sensor replacement — $100-$245 parts and labor
- EVAP purge valve replacement — $80-$200 parts and labor
- Oxygen sensor replacement — $150-$310 parts and labor
- Fuel pressure regulator repair — $120-$285 parts and labor
The 2022 Sportage may still be under Kia's basic or powertrain warranty depending on mileage. Check with your dealer.
Prevention Tips
- Replace the air filter on schedule
- Don't overfill the gas tank
- Use quality fuel
- Follow the Kia maintenance schedule
- Address check engine lights promptly