What P0174 Means on Your 2023 Ford Bronco Sport
A P0174 code on your 2023 Ford Bronco Sport means that the engine control module has detected a lean condition on Bank 2. The 2023 Bronco Sport uses a 1.5L EcoBoost turbocharged 3-cylinder in most trims or a 2.0L EcoBoost turbocharged 4-cylinder in the Badlands trim. A lean condition indicates the engine is receiving more air than fuel in the combustion mixture, and the computer cannot correct it through normal adjustments.
Common Symptoms
- Check engine light illuminated
- Rough or unsteady idle
- Reduced acceleration power
- Poor fuel efficiency
- Engine hesitation or stumble
- Whistling from the engine bay area
Most Likely Causes
- Boost Leak (35% likelihood) - Turbo intake plumbing connections can loosen or develop cracks. The charge air cooler pipes are the most common source.
- MAF Sensor Issue (25% likelihood) - Contamination from dust, oil, or debris causes incorrect airflow readings.
- PCV Valve Leak (20% likelihood) - A failed PCV valve or cracked hose introduces unmetered air into the intake.
- Fuel Injector Issue (20% likelihood) - Direct injection fuel injectors can have flow restriction or defects.
Diagnosis Steps
- Read all codes - Check for P0171 and related trouble codes.
- Boost leak test - Pressurize the intake and check for air leaks at all connections.
- Test MAF sensor - Compare live data to specifications. Clean the sensor as a first step.
- Inspect PCV system - Check valve and hoses for leaks.
- Monitor fuel trims - Verify lean condition with long-term fuel trim data.
Repair Cost Estimates
- Boost leak repair - $80 to $300. Should be warranty-covered.
- MAF sensor replacement - $120 to $290. Warranty-covered.
- PCV valve replacement - $60 to $175. Warranty-covered.
- Fuel injector service - $200 to $600. Warranty-covered.
Warranty Information
Your 2023 Bronco Sport is under Ford's 3-year/36,000-mile bumper-to-bumper warranty and 5-year/60,000-mile powertrain warranty. Take it to a Ford dealer for a free repair. Do not pay out of pocket unless modifications void the warranty.
Prevention Tips
- Keep the OEM air filter in good condition
- Inspect boost pipe connections during maintenance
- Use Top Tier fuel
- Follow Ford's maintenance schedule
- Report performance changes to your dealer early