What P0174 Means for Your 2022 Nissan Pathfinder
Your 2022 Nissan Pathfinder has set a P0174 trouble code, which indicates a lean fuel condition on Bank 2 of the engine. The 2022 Pathfinder was redesigned with an updated 3.5-liter V6 engine (VQ35DD) producing 284 horsepower, now paired with a 9-speed automatic transmission instead of the previous CVT. Bank 2 on this V6 is the rear bank near the firewall.
When the engine control module detects that its fuel trim corrections have exceeded a set threshold trying to add fuel on Bank 2, it sets P0174. This means either too much unmetered air is entering, or not enough fuel is reaching the rear bank cylinders.
Symptoms to Watch For
- Illuminated check engine light
- Rough or unsteady idle
- Reduced acceleration power, especially when loaded or climbing
- Poorer fuel economy than expected
- Hesitation or stumble on acceleration
- Occasional misfires felt as a shudder
Top Causes of P0174 in the 2022 Pathfinder
- Vacuum Leak on Bank 2 Side (35% likelihood) -- The redesigned 2022 Pathfinder intake system still uses gaskets and hoses that can leak. Rear bank leaks are common and harder to spot.
- Dirty or Failing MAF Sensor (25% likelihood) -- The mass airflow sensor measures incoming air. If contaminated, it underreports airflow, causing the ECM to inject too little fuel.
- Fuel Injector Problem on Bank 2 (25% likelihood) -- Restricted or partially clogged injectors on the rear bank deliver insufficient fuel to those cylinders.
- Exhaust Leak Before Bank 2 O2 Sensor (15% likelihood) -- A crack or loose connection in the exhaust near the Bank 2 upstream sensor causes false lean readings.
Diagnostic Steps
- Pull all stored codes -- Check for both P0171 and P0174. Both banks lean points to a central issue like MAF or fuel pressure.
- Analyze fuel trim data -- Compare short-term and long-term fuel trims for both banks. Elevated Bank 2 trims confirm an isolated issue on that side.
- Perform a smoke test -- Introduce smoke into the intake to reveal any vacuum leaks on the rear bank side of the intake manifold.
- Test the MAF sensor -- Compare live data readings to factory specifications for the VQ35DD engine.
- Inspect Bank 2 injectors and exhaust -- Check injector operation with a noid light and inspect the rear exhaust manifold for leaks.
Repair Options
- Repair vacuum leaks -- Replace deteriorated hoses, clamps, or intake gaskets on the Bank 2 side.
- Clean or replace the MAF sensor -- Try MAF cleaner spray first. Replace if readings remain out of spec.
- Service or replace Bank 2 fuel injectors -- Professional ultrasonic cleaning or new injectors.
- Seal exhaust leaks -- Replace exhaust manifold gaskets or repair cracked pipes near the Bank 2 sensor.
Estimated Repair Costs
- Vacuum leak repair: $150 - $500
- MAF sensor replacement: $200 - $420
- Fuel injector service/replacement: $300 - $750
- Exhaust leak repair: $200 - $600
The 2022 Pathfinder is still relatively new, so parts availability is good, but some components carry premium pricing.
Prevention Tips
- Replace the engine air filter every 15,000-20,000 miles
- Use top-tier gasoline to keep injectors clean
- Have vacuum lines inspected at every scheduled service
- Address unusual engine sounds or performance changes quickly
- Follow Nissan's recommended maintenance intervals