Understanding P0174 on Your 2024 Nissan Titan
Your 2024 Nissan Titan has triggered a P0174 trouble code, meaning Bank 2 of the engine is running too lean. The 2024 Titan continues with the powerful 5.6-liter Endurance V8 engine (VK56VD) producing 400 horsepower and 413 lb-ft of torque, mated to a 9-speed automatic transmission. Bank 2 on this V8 is the driver's side (left) cylinder bank.
A lean condition means the air-to-fuel ratio on Bank 2 has too much air relative to fuel. The ECM has been compensating by adding fuel, but corrections have exceeded the programmed limit, so P0174 is stored.
Symptoms to Watch For
- Check engine light illuminated
- Rough or unsteady V8 idle
- Reduced power when towing, hauling, or accelerating hard
- Worsened fuel economy from the V8's typical 15/21 MPG
- Hesitation or stumble on acceleration
- Possible misfire sensation from the affected bank
Most Likely Causes
- Vacuum Leak on Bank 2 (30% likelihood) -- Even on a new truck, a loose clamp, defective gasket, or improperly seated hose on the driver's side intake can cause a vacuum leak.
- MAF Sensor Problem (25% likelihood) -- Contamination from over-oiled aftermarket air filters or factory defects can cause the MAF to read incorrectly on the large V8 intake.
- Bank 2 Direct Injector Issue (25% likelihood) -- The high-pressure direct injectors on the VK56VD can have manufacturing defects or carbon buildup issues even on new engines.
- Exhaust Leak on Bank 2 Side (20% likelihood) -- A loose exhaust manifold bolt or gasket defect on the driver's side can introduce air near the O2 sensor.
Diagnostic Approach
- Read all stored codes -- Look for companion codes on Bank 1 (P0171) and any injector circuit or misfire codes.
- Review fuel trim data -- Compare Bank 1 and Bank 2 long-term fuel trims to isolate the problem.
- Smoke test the intake -- Pressurize the intake system and check for leaks on the Bank 2 side.
- Test MAF sensor readings -- Compare to VK56VD factory specifications.
- Check fuel rail pressure and injectors -- Test the high-pressure fuel system and individual injector performance on Bank 2.
Repair Options
- Seal vacuum leaks -- Tighten clamps, replace gaskets, or fix hoses on the Bank 2 intake.
- Replace MAF sensor -- Clean first with MAF cleaner. Replace if readings stay out of range.
- Service direct injectors -- Clean or replace the high-pressure Bank 2 injectors.
- Fix exhaust leaks -- Tighten manifold bolts or replace gaskets on the driver's side.
Estimated Repair Costs
- Vacuum leak repair: $180 - $600
- MAF sensor replacement: $220 - $500
- Fuel injector service/replacement: $450 - $1,300
- Exhaust leak repair: $250 - $700
Important: Your 2024 Titan is fully covered under Nissan's 5-year/60,000-mile powertrain warranty and the federal 8-year/80,000-mile emissions warranty. Take it to the dealer first for no-cost repairs.
Prevention Tips
- Use only OEM or quality equivalent air filters -- avoid over-oiled aftermarket options
- Use top-tier gasoline to protect the direct injection fuel system
- Report any performance changes to your dealer immediately while under warranty
- Check for TSBs and recalls applicable to the 2024 Titan
- Follow the maintenance schedule in your owner's manual