P0174 on Your 2022 Hyundai Tucson Explained
Your 2022 Hyundai Tucson has set a P0174 trouble code, indicating a lean fuel condition detected by the engine control module. The 2022 Tucson was redesigned with a 2.5-liter Smartstream inline-4 engine producing 187 horsepower and an 8-speed automatic transmission. Since this is an inline-4 with one bank, the P0174 code relates to how the ECU interprets oxygen sensor data and fuel trim corrections.
When the ECM detects that its fuel trim corrections have exceeded the normal range trying to add fuel, it stores P0174. This means there's an imbalance of too much air or insufficient fuel.
Symptoms You Might Notice
- Check engine light on
- Rough or unsteady idle
- Hesitation when accelerating
- Worse fuel economy than the rated 26/33 MPG
- Engine surging at idle
- Possible stalling or misfires
Common Causes
- Vacuum Leak (40% likelihood) -- The redesigned 2022 Tucson intake system uses gaskets and hoses that can leak if there's a loose clamp or manufacturing defect.
- Contaminated MAF Sensor (25% likelihood) -- Oil mist from the PCV system or a dirty air filter can coat the mass airflow sensor element.
- Fuel System Issue (20% likelihood) -- A weak fuel pump, restricted filter, or failing fuel pressure regulator can reduce fuel delivery.
- Dirty Fuel Injectors (15% likelihood) -- Carbon deposits or fuel contamination can restrict injector flow.
How to Diagnose
- Pull all codes -- Check for P0171, MAF codes, and misfire codes.
- Check fuel trims -- LTFT above +15% confirms the lean issue.
- Smoke test -- Find vacuum leaks in the 2.5L intake system.
- Test MAF sensor -- Compare to Hyundai specs for the Smartstream 2.5L.
- Verify fuel pressure -- Test at idle and under load.
Repair Options
- Vacuum leak repair -- Replace hoses, clamps, or gaskets.
- 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 - $350
- MAF sensor replacement: $140 - $340
- Fuel pump replacement: $400 - $720
- Fuel injector service: $170 - $480
The 2022 Tucson should still be under Hyundai's warranty coverage. Check before paying out of pocket.
Prevention Tips
- Replace the air filter at recommended intervals
- Use quality gasoline from top-tier stations
- Have vacuum connections checked during routine service
- Address check engine lights promptly
- Follow Hyundai's maintenance schedule