What P0174 Means on Your 2022 Hyundai Santa Fe
Your 2022 Hyundai Santa Fe has stored a P0174 code, indicating a lean fuel condition. The 2022 Santa Fe was updated with a 2.5-liter Smartstream inline-4 engine producing 191 horsepower, paired with an 8-speed automatic transmission. As an inline-4, this engine has one bank, but P0174 can appear from ECU fuel trim corrections exceeding normal limits.
The 2022 model uses the newer Smartstream engine platform, which differs from the previous Theta II. The fuel delivery and intake systems are updated, but lean conditions can still occur from similar root causes.
Symptoms to Watch For
- Check engine light on
- Rough idle, especially at startup
- Reduced power when loaded or climbing hills
- Lower fuel economy than the rated 26/33 MPG
- Hesitation during acceleration
- Engine surging or misfires
Common Causes
- Vacuum Leak (40% likelihood) -- Intake manifold gaskets, vacuum hoses, or PCV connections can leak from manufacturing variations or early wear.
- MAF Sensor Issue (25% likelihood) -- Contamination from aftermarket air filters or PCV blowby can affect the mass airflow sensor.
- Fuel Delivery Problem (20% likelihood) -- A weak fuel pump, restricted filter, or faulty pressure regulator reduces fuel supply.
- Fuel Injector Restriction (15% likelihood) -- Carbon deposits or debris can restrict injector flow on the 2.5L engine.
How to Diagnose
- Scan all codes -- Check for P0171, MAF codes, and misfire codes.
- Review fuel trims -- LTFT above +15% confirms the lean condition.
- Smoke test -- Find vacuum leaks in the Smartstream 2.5L intake system.
- Test MAF sensor -- Compare readings to Hyundai specifications.
- Verify fuel pressure -- Test at idle and under load.
Repair Options
- Vacuum leak repair -- Replace hoses, gaskets, or PCV components.
- MAF sensor service -- Clean or replace.
- Fuel system repair -- Replace pump, filter, or regulator.
- Injector service -- Clean or replace affected injectors.
Estimated Repair Costs
- Vacuum leak repair: $100 - $380
- MAF sensor replacement: $150 - $350
- Fuel pump replacement: $430 - $780
- Fuel injector service: $180 - $520
The 2022 Santa Fe should still be under Hyundai's warranty. Check coverage before paying out of pocket.
Prevention Tips
- Use OEM or quality air filters
- Fill up with top-tier gasoline
- Report performance changes to the dealer while under warranty
- Follow Hyundai's maintenance schedule
- Check for TSBs and recalls