Understanding P0175 on the 2022 Nissan Maxima
The 2022 Nissan Maxima continues with the proven VQ35DE 3.5L V6 producing 300 hp and paired with the Xtronic CVT. As one of the final model years for the Maxima, the 2022 benefits from years of engine refinement. Bank 2 on the VQ35DE is the front cylinder bank (cylinders 1, 3, 5). P0175 indicates the ECM has detected persistent over-fueling on this bank, meaning too much fuel relative to the air charge.
Symptoms
- Check engine light on
- Fuel economy declining from the rated 20-30 MPG
- Idle quality deterioration
- Black exhaust smoke or deposits on tailpipe
- Hesitation on acceleration
- Fuel odor from exhaust
Top Causes on the 2022 Maxima
1. Dirty MAF Sensor (High Likelihood)
At 20,000-40,000 miles typical of 2022 models, the MAF sensor may have accumulated enough PCV oil vapor and particulate contamination to affect readings. The VQ35DE's high-airflow intake design amplifies any sensor error. A dirty MAF reads lower airflow, causing the ECM to over-fuel. Cleaning with dedicated MAF sensor spray is the fastest, cheapest first step. This 10-minute DIY job resolves P0175 in the majority of cases.
3. Bank 2 O2 Sensor Beginning to Degrade (Medium Likelihood)
While 20,000-40,000 miles is early for O2 sensor failure, the Maxima's performance-oriented tuning generates high exhaust temperatures that stress sensors faster. The front bank O2 sensor is closest to the catalytic converter and experiences the most heat. Check sensor response on a scan tool -- a healthy sensor should switch between rich and lean rapidly. Any sluggishness indicates replacement is needed.
3. Port Fuel Injector Leak (Medium Likelihood)
The VQ35DE's port fuel injectors on cylinders 1, 3, and 5 can develop seal deterioration even at moderate mileage. Heat cycling from the engine bay, combined with fuel additives and detergents, gradually degrades the rubber seals. A leaking injector adds fuel when it should be sealed, enriching the Bank 2 mixture. A fuel pressure decay test will identify any leaking injectors.
4. PCV System Malfunction (Low Likelihood)
A stuck-open PCV valve or cracked PCV hose allows excessive oil-laden crankcase vapors into the intake manifold. While a small amount of crankcase vapor is normal, excessive flow adds unmetered hydrocarbons to the mixture, pushing it rich. The PCV valve on the VQ35DE is accessible and can be checked by shaking it (should rattle) and ensuring it only flows in one direction.
CVT Behavior Notes
The 2022 Maxima's CVT uses D-step programming that simulates 7 gear ratios for a more engaging driving experience. When running rich from P0175, the CVT may hold simulated lower gears longer to compensate for reduced power. This can feel like the car is reluctant to upshift or that acceleration is duller than normal.
Diagnosis Steps
- Scan all codes. Check for companion codes P0172, P0101, or misfire codes.
- Monitor Bank 2 LTFT data. Values more negative than -10% confirm the rich condition.
- Clean the MAF sensor and clear codes. Drive for 2-3 cycles.
- Test the Bank 2 O2 sensor response time on a scan tool.
- Perform fuel pressure and injector testing if needed.
- Check PCV valve and associated hoses for proper operation.
Cost Estimates
MAF cleaning: $10-$15. MAF replacement: $120-$270. O2 sensor: $160-$340. Fuel injector: $130-$280 per injector. PCV valve: $15-$35. Diagnostic time: $90-$150/hour.