Understanding P0174 on Your 2024 Nissan Pathfinder
If your 2024 Nissan Pathfinder has triggered a P0174 code, the engine control module is alerting you that Bank 2 is running lean. The 2024 Pathfinder continues with the proven 3.5-liter V6 engine (VQ35DD) making 284 horsepower, mated to a 9-speed automatic transmission. With a true V6 layout, Bank 2 refers to the rear cylinder bank near the firewall.
Running lean means the air-fuel mixture has too much air relative to fuel on the Bank 2 side. The ECM tries to compensate by adding fuel, but when corrections exceed the programmed limit, P0174 is stored and the check engine light comes on.
What Symptoms to Expect
- Check engine light on
- Rough or inconsistent idle quality
- Reduced power during acceleration or towing
- Lower fuel economy than normal for a V6 SUV
- Hesitation when pressing the gas pedal
- Possible misfires or shuddering at low RPM
Most Likely Causes for the 2024 Pathfinder
- Vacuum Leak at Bank 2 Intake (35% likelihood) -- Even on a new vehicle, manufacturing defects or loose clamps on the rear intake runners can cause unmetered air to enter Bank 2.
- MAF Sensor Contamination (30% likelihood) -- The mass airflow sensor can become contaminated if aftermarket air filters are over-oiled or if there's PCV system blowby.
- Fuel Delivery Issue (20% likelihood) -- A weak fuel pump, clogged fuel filter, or restricted fuel injector on Bank 2 can reduce fuel supply below what the engine needs.
- Exhaust System Leak (15% likelihood) -- A leak in the exhaust manifold or downpipe on the Bank 2 side near the upstream O2 sensor causes false lean readings.
How to Diagnose the Issue
- Read all stored codes -- Check for companion codes. P0171 alongside P0174 suggests a shared cause. Misfire codes point to specific cylinders.
- Review fuel trim data -- Compare Bank 1 and Bank 2 long-term fuel trims on a scan tool. Bank 2 LTFT above +15% confirms the lean condition.
- Smoke test the intake system -- This is the most effective way to find vacuum leaks on the V6. Focus on the rear bank connections.
- Test the MAF sensor -- Compare readings at idle and 2,500 RPM to factory specs for the VQ35DD.
- Check fuel pressure and injector balance -- Verify fuel rail pressure meets spec and that all Bank 2 injectors flow evenly.
Repair Options
- Fix vacuum leaks -- Tighten clamps, replace gaskets, or swap out cracked hoses on the rear bank.
- Clean or replace MAF sensor -- Use dedicated MAF sensor cleaner. Replace if readings don't normalize.
- Address fuel delivery problems -- Replace the fuel pump, filter, or specific injectors as needed.
- Repair exhaust leaks -- Replace exhaust gaskets or weld cracks near the Bank 2 O2 sensor.
Estimated Repair Costs
- Vacuum leak repair: $150 - $500
- MAF sensor replacement: $200 - $450
- Fuel pump or injector service: $350 - $800
- Exhaust leak repair: $200 - $600
Since the 2024 Pathfinder is brand new, many repairs may be covered under Nissan's powertrain warranty (5 years/60,000 miles). Check your warranty status first.
Prevention Tips
- Use only quality OEM or equivalent air filters -- avoid over-oiled aftermarket filters
- Fill up with top-tier gasoline to keep injectors clean
- Don't ignore minor performance changes -- early detection prevents expensive repairs
- Have the dealer check for technical service bulletins (TSBs) related to P0174
- Keep up with all scheduled maintenance per the owner's manual