What Does P0172 Mean on Your 2024 Nissan Pathfinder?
A P0172 code on the 2024 Nissan Pathfinder means the powertrain control module has detected that Bank 1 is running too rich. The 2024 Pathfinder continues with the 3.5L VQ35DD V6 engine producing 284 horsepower paired with the 9-speed automatic transmission. Bank 1 is the rear bank closest to the firewall.
A rich condition means excess fuel is entering the combustion chambers, reducing fuel economy and potentially damaging the catalytic converter. Since the 2024 Pathfinder is under full factory warranty, take it to the dealer for diagnosis and repair.
Common Symptoms You May Notice
- Check engine light on
- Reduced fuel economy
- Rough or unsteady idle
- Black exhaust smoke
- Fuel smell at the tailpipe
- Sluggish acceleration
Top Causes of P0172 on the 2024 Pathfinder
- Dirty MAF sensor - The mass airflow sensor can accumulate contamination even on a new vehicle, causing underreported airflow and excess fueling.
- Defective upstream O2 sensor - A manufacturing defect in the oxygen sensor can cause incorrect fuel trim calculations.
- Leaking fuel injector - A direct injection injector on the rear bank that fails to seal properly delivers excess fuel.
- EVAP purge valve malfunction - A stuck-open purge valve sends excess fuel vapors into the intake manifold.
How to Diagnose the Problem
Scan codes and check freeze frame data. Review Bank 1 STFT and LTFT. Negative LTFT past -10% confirms the rich condition.
The dealer will clean or replace the MAF sensor, test the O2 sensor, check fuel injectors, and inspect the EVAP system as part of their diagnostic process.
Repair Options and Cost Estimates
- MAF sensor cleaning or replacement: Cleaning under $10. New sensor $45-$160 plus $40-$95 labor.
- O2 sensor replacement: Parts $45-$155. Labor $70-$150.
- Fuel injector replacement: Parts $35-$105 per injector. Labor $185-$395.
- EVAP purge valve: Parts $20-$55. Labor $45-$100.
Can You Fix This Yourself?
Since the 2024 Pathfinder is under warranty, let the Nissan dealer handle all repairs. Manufacturing defects will be repaired at no cost to you.
Prevention Tips
- Follow the factory maintenance schedule
- Use quality fuel from reputable stations
- Address check engine lights promptly to maintain warranty
- Keep all service records