What Does P0171 Mean on a 2022 Nissan Maxima?
If your 2022 Nissan Maxima has set a P0171 code, the engine control module detected a lean air-fuel mixture on Bank 1. The 2022 Maxima is powered by a 3.5L V6 engine (VQ35DE) producing 300 horsepower with a CVT transmission. On this V6, Bank 1 is one of the cylinder banks. The 2022 was among the final model years of the Maxima, and the VQ35 engine has a long track record.
A lean condition on the Maxima needs attention since this is a performance-oriented sedan that benefits from precise fuel delivery for its 300 hp output.
Symptoms You Might Notice
- Check engine light on
- Rough idle
- Hesitation or flat spots during acceleration
- Reduced fuel economy
- Engine surging
- Possible misfires on Bank 1
Common Causes of P0171 on the 2022 Nissan Maxima
- MAF Sensor Contamination (30% likelihood) - The mass airflow sensor is the top suspect on Nissan V6 engines. Dust and oil contamination cause inaccurate readings.
- Vacuum Leak (25% likelihood) - Intake gaskets, PCV hoses, and other vacuum connections can develop leaks.
- Fuel Injector Wear (25% likelihood) - Port fuel injectors can develop flow issues, delivering less fuel than commanded.
- O2 Sensor Issue (20% likelihood) - A sluggish upstream O2 sensor on Bank 1 can miscalculate the fuel mixture.
How to Diagnose the Problem
- Scan for codes - Check for P0174, misfire codes, O2 sensor codes.
- Monitor fuel trims - Compare Bank 1 vs Bank 2 LTFT.
- Clean the MAF sensor - Cheapest first step.
- Smoke test the intake - Find vacuum leaks.
- Test fuel pressure and O2 sensors - Verify proper operation.
Repair Options and Cost Breakdown
- MAF sensor service - $50 to $280.
- Vacuum leak repair - $150 to $450.
- Fuel injector cleaning/replacement - $200 to $500.
- O2 sensor replacement - $150 to $400.
Can You DIY This Repair?
MAF cleaning is an easy 10-minute job. O2 sensor replacement needs basic tools. Intake and fuel system work on the transverse V6 is more involved.
Prevention Tips
- Use premium fuel as recommended
- Clean the MAF sensor annually
- Replace air filter on schedule
- Follow Nissan's maintenance intervals
- Inspect hoses during oil changes