P0175 Nissan Altima
System Too Rich (Bank 2) · Powertrain Code · Medium · Repair: Moderate
What is P0175?
The engine is running rich on bank 2. Same causes as P0172 but affecting the opposite cylinder bank.
When the Nissan Altima triggers code P0175 (system too rich (bank 2)), it typically points to an issue in the powertrain system. Below you'll find the most common causes, symptoms, and repair options specific to the Nissan Altima.
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 Altima.
Common Causes on Nissan Altima
- Contaminated MAF sensor affecting Bank 2 reading (VQ35 engines)
- Vacuum leak on Bank 2 intake manifold
- Leaking fuel injector on Bank 2
- Restricted air filter affecting overall airflow measurement
- Failing fuel pressure regulator
Symptoms
- Check Engine Light on
- Rich exhaust smell
- Poor fuel economy
- Rough running on Bank 2 cylinders
- Fouled Bank 2 spark plugs
Notes for Nissan Altima
P0175 only applies to V6 models (Pathfinder, Altima 3.5); on 4-cylinder engines, only P0172 can set.