What Does P0172 Mean on Your 2022 Kia Sorento?
If your 2022 Kia Sorento is displaying a P0172 code, the engine control module has detected that the fuel mixture is running too rich. The base 2022 Sorento uses a 2.5-liter Smartstream inline-4 engine producing 191 horsepower. As an inline-4 with one bank, P0172 means the whole engine is getting excess fuel. The ECM uses oxygen sensor data and fuel trim adjustments to maintain the ideal air-fuel ratio, and this code sets when corrections exceed normal limits.
Symptoms You Might Notice
- Check engine light on
- Fuel economy below the rated 29 mpg combined
- Black or dark exhaust smoke
- Rough or uneven idle
- Sluggish throttle response
- Gasoline odor from the exhaust
Common Causes of P0172 on the 2022 Sorento
- Dirty MAF Sensor — Contamination on the mass airflow sensor causes inaccurate airflow measurements, leading to over-fueling. This is the most common P0172 cause.
- Stuck Open EVAP Purge Valve — A documented Kia issue. The canister purge valve sticks open, continuously drawing fuel vapors into the intake manifold.
- Failing Oxygen Sensor — The upstream O2 sensor may have degraded, providing slow or biased feedback to the ECM.
- Fuel Pressure Regulator Issue — Excessive fuel rail pressure forces more fuel through the injectors than the ECM calculates.
How to Diagnose the Problem
- Scan for all codes — EVAP codes (P0441, P0455) alongside P0172 point to a purge valve problem.
- Check fuel trim data — LTFT below -10% confirms the rich condition.
- Clean the MAF sensor — At idle, the 2.5L should read about 4-9 g/s. Use MAF-specific cleaner.
- Test the purge valve — Disconnect and plug the purge hose. If trims improve, replace the valve.
- Verify fuel pressure — Check against manufacturer 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 — $125-$290 parts and labor
Check your Kia warranty status — the 2022 Sorento may still be under the basic or powertrain warranty depending on mileage.
Prevention Tips
- Replace the air filter at recommended intervals
- Don't overfill the gas tank
- Use quality fuel from Top Tier stations
- Follow the Kia maintenance schedule
- Address check engine lights quickly to prevent catalytic converter damage