What Does P0174 Mean on Your 2021 Kia Telluride?
A P0174 code on your 2021 Kia Telluride means the ECM detected a lean air-fuel mixture on Bank 2. The 2021 Telluride is powered by a 3.8-liter V6 engine producing 291 horsepower and 262 lb-ft of torque. As a V6 with two distinct cylinder banks, P0174 clearly points to a lean condition on the Bank 2 side of the engine.
The Telluride is Kia's flagship three-row SUV, frequently used for family trips and towing. A lean condition under these loads can stress the engine and catalytic converter. Your Telluride should still be under Kia's warranty, so start at the dealership.
Common Symptoms You May Notice
- Check engine light on
- Rough idle or vibration
- Hesitation during acceleration
- Reduced power when towing
- Lower fuel economy
- Engine misfires
Most Likely Causes of P0174 on the 2021 Telluride
- Vacuum Leak on Bank 2 - The 3.8L V6 has vacuum routing that can develop cracks or leaks on the Bank 2 side. Intake manifold gasket issues are also possible.
- Dirty MAF Sensor - Contamination causing underreported airflow and lean fueling.
- Failing Bank 2 O2 Sensor - A degrading upstream O2 sensor on Bank 2 causing lean fuel trim adjustments.
- Fuel Delivery Problem - Weak fuel pump or restricted fuel flow under high demand.
How to Diagnose the Problem
- Scan codes - Confirm P0174 and check for P0171 or misfire codes.
- Monitor fuel trims - Compare LTFT on both banks. High positive LTFT on Bank 2 only confirms a bank-specific issue.
- Inspect vacuum system - Focus on the Bank 2 side of the V6.
- Clean MAF sensor - Quick diagnostic step.
- Test fuel pressure - Verify proper pressure for the 3.8L engine.
Repair Options and Cost Breakdown
- Warranty repair - $0 if covered.
- Vacuum hose repair - $10 to $40.
- Intake manifold gasket - $100 to $200, plus $250 to $450 labor.
- MAF sensor cleaning - $8 to $15.
- MAF sensor replacement - $110 to $230, plus $50 to $100 labor.
- O2 sensor replacement - $110 to $260, plus $100 to $180 labor.
- Fuel pump replacement - $300 to $520, plus $200 to $350 labor.
Can You Fix This Yourself?
The Telluride is a premium SUV but still offers decent access for basic repairs. MAF cleaning and vacuum hose checks are simple. O2 sensor replacement requires a sensor socket. Intake gasket work on the V6 is more involved. If under warranty, let Kia handle it for free.
Prevention Tips
- Replace air filter at recommended intervals
- Use top-tier fuel
- Inspect vacuum hoses during oil changes
- Follow Kia maintenance schedule
- Clean MAF sensor every 30,000 miles