What P0174 Means for Your 2024 Hyundai Tucson
Your 2024 Hyundai Tucson has triggered a P0174 code, indicating a lean fuel condition. The 2024 Tucson uses a 2.5-liter inline-4 engine (Smartstream) producing 187 horsepower, paired with an 8-speed automatic transmission. As an inline-4, the engine has a single cylinder bank, but P0174 can still appear depending on ECU calibration and oxygen sensor interpretation.
A lean condition means the air-fuel mixture has shifted toward too much air or too little fuel. The ECM has been adding fuel to compensate, but it has exceeded its correction limit.
Symptoms You May Experience
- Check engine light on
- Rough or uneven idle
- Sluggish acceleration, especially with passengers or cargo
- Reduced fuel economy from the Tucson's rated 26/33 MPG
- Hesitation when pressing the gas pedal
- Possible engine misfires or shuddering
Top Causes for the 2024 Tucson
- Vacuum Leak (40% likelihood) -- Even on a new vehicle, loose clamps, factory gasket defects, or improperly seated hoses can create vacuum leaks in the intake system.
- MAF Sensor Contamination (25% likelihood) -- An over-oiled aftermarket air filter or PCV system issue can contaminate the mass airflow sensor.
- Fuel Delivery Issue (20% likelihood) -- A defective fuel pump, restricted filter, or faulty fuel pressure regulator can reduce fuel supply.
- Fuel Injector Problem (15% likelihood) -- A manufacturing defect or debris in the fuel system can restrict an injector.
Diagnostic Approach
- Scan all codes -- Look for companion codes like P0171, P0101, or misfire codes.
- Review fuel trim data -- LTFT above +15% confirms the lean condition.
- Smoke test the intake -- Pressurize the intake system and look for leaks.
- Test the MAF sensor -- Compare readings to Hyundai's specs for the 2.5L Smartstream.
- Check fuel pressure -- Verify the fuel system delivers adequate pressure at idle and under load.
Repair Options
- Seal vacuum leaks -- Tighten clamps, replace gaskets, or fix hoses.
- Service MAF sensor -- Clean with dedicated cleaner or replace.
- Fix fuel delivery -- Replace pump, filter, or regulator as needed.
- Service injectors -- Clean or replace restricted injectors.
Estimated Repair Costs
- Vacuum leak repair: $100 - $350
- MAF sensor replacement: $150 - $350
- Fuel pump replacement: $420 - $750
- Fuel injector service: $180 - $500
Your 2024 Tucson is fully covered under Hyundai's 5-year/60,000-mile new vehicle warranty and 10-year/100,000-mile powertrain warranty. Visit the dealer first.
Prevention Tips
- Stick with OEM or quality equivalent air filters
- Use top-tier fuel for optimal fuel system health
- Report any performance changes to your dealer while under warranty
- Follow Hyundai's maintenance schedule
- Check for TSBs and recalls for the 2024 Tucson