P0174 Ford F-150
System Too Lean (Bank 2) · Powertrain Code · High · Repair: Moderate
What is P0174?
The engine is running lean on bank 2. Same causes as P0171 but affecting the opposite cylinder bank on V-engines.
When the Ford F-150 triggers code P0174 (system too lean (bank 2)), it typically points to an issue in the powertrain system. This is a high severity code, so address it promptly to avoid further damage or safety concerns. Below you'll find the most common causes, symptoms, and repair options specific to the Ford F-150.
This repair is rated moderate, meaning some experience and specialty tools required.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Ford F-150.
Common Causes on Ford F-150
- Vacuum leak on bank 2 side of 3.5L EcoBoost or 5.0L Coyote intake
- Cracked charge air cooler tube on passenger side of EcoBoost
- Bank 2 fuel injector stuck or restricted on 5.0L V8
- PCV hose deterioration on passenger valve cover
- Exhaust leak at bank 2 manifold causing false O2 sensor reading
Symptoms
- Rough idle especially when cold
- Hesitation or stumble on acceleration
- Engine surging at steady throttle
- Lean misfire under load
- Poor fuel economy
- Check engine light illuminated
Notes for Ford F-150
On 3.5L EcoBoost, check intercooler boots for leaks. On 5.0L Coyote, bank 2 injector issues are a known concern at higher mileage.