P0174 Nissan Pathfinder
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 Nissan Pathfinder 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 Nissan Pathfinder.
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 Nissan Pathfinder.
Common Causes on Nissan Pathfinder
- Intake manifold gasket leak on bank 2 of 3.5L VQ V6
- Cracked vacuum hose on passenger side of engine
- Bank 2 fuel injector deposits or electrical failure
- PCV valve stuck open allowing excessive airflow
- Exhaust leak at bank 2 manifold before O2 sensor
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 Nissan Pathfinder
Rogue 4-cylinder models will not set P0174 as they only have one bank. Pathfinder and Murano V6 models are known for intake gasket issues on bank 2.