Understanding P0175 on the 2022 Nissan Pathfinder
The 2022 Nissan Pathfinder was completely redesigned on a new platform, dropping the CVT in favor of a 9-speed automatic transmission. It retains a 3.5L V6 engine (VQ35DD) producing 284 hp with direct fuel injection. Bank 2 on this V6 is the front cylinder bank (cylinders 1, 3, 5). When the ECM sets P0175, it means Bank 2 fuel trims have drifted too far rich, indicating excess fuel delivery relative to air intake.
Signs of a Rich Condition
- Check engine light illuminated
- Fuel economy below the rated 21-27 MPG range
- Rough idle or vibration at stop lights
- Black smoke from exhaust during hard acceleration
- Fuel smell near the tailpipe
- Possible misfire codes accompanying P0175
Top Causes on the 2022 Pathfinder
1. MAF Sensor Contamination (High Likelihood)
The redesigned 2022 Pathfinder retains the V6 engine with its substantial airflow demands. The MAF sensor sits in the air intake tract and measures all incoming air for the ECM's fuel calculations. Oil vapor from the PCV system, combined with road dust, coats the hot-wire sensing element over time. Even at the relatively low mileage of most 2022 models (20,000-40,000 miles), MAF contamination can occur, especially in dusty climates or if the air filter hasn't been changed on schedule.
2. Bank 2 Upstream O2 Sensor Issue (Medium Likelihood)
The upstream oxygen sensor on Bank 2 provides the critical fuel trim feedback loop. On the VQ35DD, this sensor is positioned in the front exhaust manifold. While sensor failure at 2-3 years is uncommon, premature degradation can occur from exposure to silicone-based gasket sealers, contaminated fuel, or excessive engine oil consumption. Test the sensor response with a graphing scan tool -- it should alternate between rich and lean readings rapidly.
3. Direct Injection Carbon Buildup (Medium Likelihood)
One downside of direct injection is carbon buildup on the intake valves and injector tips, since fuel spray doesn't wash the back of the valves as it does in port injection. On Bank 2, carbon deposits can affect injector spray patterns and prevent proper sealing. This leads to incomplete combustion and excess fuel in the exhaust. Carbon cleaning services (walnut blasting or chemical cleaning) may be needed.
4. Intake Manifold Gasket Leak (Low Likelihood)
While less common on newer vehicles, a poorly sealed intake manifold gasket can allow unmetered air or affect vacuum signals, disrupting fuel trim calculations. On the 2022 Pathfinder, inspect the intake manifold connections and vacuum hoses for any signs of degradation or improper sealing.
New 9-Speed Automatic vs. Old CVT
Unlike the previous Pathfinder's CVT, the 2022's ZF 9-speed automatic does not alter its behavior as noticeably when P0175 is present. However, the transmission may still adapt its shift points based on reduced engine output from the rich condition. Some owners notice slightly delayed upshifts as the TCM tries to maintain power.
Diagnostic Steps
- Scan all codes. Check for Bank 1 codes to determine if the issue is bank-specific or system-wide.
- Review freeze frame and mode $06 data for fuel trim and O2 sensor information.
- Monitor Bank 2 STFT and LTFT. Negative LTFT values beyond -8% confirm chronic enrichment.
- Clean the MAF sensor with dedicated cleaner.
- Graph the Bank 2 upstream O2 sensor for response time and voltage accuracy.
- If needed, perform injector balance and fuel pressure testing.
Cost Estimates
MAF sensor cleaning: $10-$15. MAF replacement: $140-$310. O2 sensor: $190-$380. Carbon cleaning service: $300-$600. Injector replacement: $300-$550 per injector. Intake manifold gasket: $250-$500. Diagnostic time: $100-$150/hour.