P0174 Honda Pilot
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 Honda Pilot 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 Honda Pilot.
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 Honda Pilot.
Common Causes on Honda Pilot
- Intake manifold gasket leak on bank 2 of 3.5L V6 Pilot
- PCV valve failure on passenger side of 3.5L V6
- Vacuum leak at intake runner on bank 2
- Bank 2 fuel injector flow restriction
- Mass airflow sensor reading inaccurately
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 Honda Pilot
P0174 is uncommon on 4-cylinder CR-V and HR-V models as they only have one bank. Pilot V6 models can develop bank 2 lean codes from intake gasket deterioration.