What Does P0171 Mean on Your 2024 Infiniti QX60?
A P0171 code on your 2024 Infiniti QX60 means the engine control module detected a lean air-fuel condition on Bank 1. The 2024 QX60 uses the 3.5-liter V6 engine (VQ35DD) producing 295 horsepower with direct injection. Bank 1 is the rear cylinder bank on this transverse V6. The ECM is compensating by adding extra fuel to maintain the correct air-fuel ratio.
Symptoms You Might Notice
- Check engine light illuminated
- Rough or unsteady idle
- Reduced throttle response
- Fuel economy below the expected 21-26 MPG
- Subtle vibration at idle
- Slight power loss during acceleration
Common Causes of P0171 on the 2024 Infiniti QX60
Most issues on a newer vehicle should be warranty-covered:
- Vacuum or Intake Leak (30% likelihood) — Factory assembly issues with intake gaskets or vacuum line connections.
- ECM Software Calibration (30% likelihood) — Nissan/Infiniti may have released fuel management updates for the VQ35DD engine.
- MAF Sensor Issue (25% likelihood) — A defective or contaminated mass air flow sensor sending incorrect data.
- Fuel System Component (15% likelihood) — A weak fuel pump, faulty injector, or fuel pressure sensor issue.
How to Diagnose the Problem
- Visit your Infiniti dealer — The 2024 QX60 is under Infiniti's 4-year/60,000-mile warranty. Let the dealer diagnose and repair for free.
- Request TSB check — Ask about Technical Service Bulletins specific to the VQ35DD and P0171.
- Independent diagnosis — Check fuel trims on both banks with an OBD-II scanner. Compare Bank 1 and Bank 2 readings.
- Smoke test — Professional vacuum leak detection for the intake system.
- Live data monitoring — Watch MAF, fuel pressure, and O2 sensor data during driving.
Repair Options and Cost Breakdown
- Vacuum or intake leak repair: $150–$400. Should be warranty-covered.
- ECM software update: $0–$200. Free under warranty.
- MAF sensor replacement: $180–$350. Part cost $70–$160. Easy DIY if out of warranty.
- Fuel system repair: $400–$900. Covered under powertrain warranty.
Prevention Tips
- Use premium fuel for optimal VQ35DD performance
- Follow Infiniti's maintenance schedule
- Replace the air filter at recommended intervals
- Report any performance changes to the dealer while under warranty
- Use Infiniti-recommended oil specifications
Warranty Coverage
The 2024 Infiniti QX60 is covered by a 4-year/60,000-mile bumper-to-bumper warranty and a 6-year/70,000-mile powertrain warranty. All engine and fuel system components are included. Visit your Infiniti dealer for free diagnosis and repair.