P0174 Code What It Means and How to Fix It

System Too Lean (Bank 2)

Have you seen a P0174 code on your car’s scanner? Don’t worry! This means the engine is getting too much air and not enough fuel on Bank 2 (the side of the engine opposite Cylinder 1). Let’s break it down and help you fix it!

What Causes the P0174 Code?

Here are some common reasons your car might show this code:

1. Vacuum Leaks
   • Air is sneaking into the engine where it shouldn’t. Check hoses, intake gaskets, or the PCV valve.
2. Dirty or Bad Mass Airflow (MAF) Sensor
   • This sensor measures air entering the engine. If it’s dirty, it can send the wrong info to your car’s computer.
3. Fuel Problems
   • A weak fuel pump, clogged fuel filter, or dirty fuel injectors might not deliver enough fuel.
4. Faulty Oxygen (O2) Sensor
   • The O2 sensor might not read the air-fuel mix correctly, causing errors.
5. Exhaust Leaks
   • Small leaks near the O2 sensor can confuse the system.

What Are the Symptoms?

If your car has this issue, you might notice:

• Check Engine Light is on.
• Your car runs rough or uneven.
• It’s harder to accelerate.
• Gas mileage goes down.

How to Fix the P0174 Code

Here’s what you can do:

1. Check for Leaks
   • Inspect vacuum hoses or use a smoke test to find leaks.
2. Clean the MAF Sensor
   • Use a special MAF cleaner spray to remove dirt.
3. Inspect Fuel System
   • Test the fuel pressure and clean or replace clogged injectors.
4. Check Oxygen Sensors
   • Use a scan tool to see if the O2 sensor is working. Replace it if needed.
5. Fix Exhaust Leaks
   • Look for cracks or holes near the exhaust system.

Be Proactive to Prevent This Code

• Keep up with regular maintenance.
• Use high-quality gas and consider adding a fuel system cleaner.
• Check air filters and clean sensors regularly.

Why It’s Important

Fixing the P0174 code keeps your car running smoothly, saves gas, and prevents bigger problems later. After repairs, clear the code with a scanner and test drive to ensure it’s fixed.