P0174 Ford Bronco Sport
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 Bronco Sport 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 Bronco Sport.
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 Bronco Sport.
Common Causes on Ford Bronco Sport
- Cracked intake charge pipe on 1.5L EcoBoost
- PCV system failure in valve cover assembly
- Vacuum leak at brake booster hose
- Mass airflow sensor reading incorrectly
- Fuel injector tip deposits from direct injection
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 Bronco Sport
P0174 is uncommon on 4-cylinder Escape and Bronco Sport models as they only have one bank. Only the 2.0L twin-scroll or older V6 models would set this code.