how to troubleshoot and fix P0174 code on Ford Explorer Sixth Generation (2020-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect Air Intake System

• Remove the engine cover (if applicable) using a socket set.
• Check all connections in the air intake system for cracks or loose clamps.
• Replace any damaged hoses or clamps as necessary.
• Reinstall the engine cover securely.

3. Test and Clean the MAF Sensor

• Locate the MAF sensor in the air intake duct.
• Disconnect the electrical connector from the MAF sensor.
• Remove the MAF sensor using a Torx screwdriver.
• Clean the sensor using MAF cleaner and let it dry completely.
• Reinstall the MAF sensor and reconnect the electrical connector.

4. Fuel Pressure Check

• Connect a fuel pressure gauge to the fuel rail Schrader valve.
• Turn the ignition to the "ON" position (do not start the engine) and record the fuel pressure reading.
• Compare the reading to the manufacturer’s specifications (usually around 50-60 psi for most Ford models).
• If pressure is low, inspect the fuel pump, filter, and fuel lines for restrictions or faults.

5. Inspect and Test Fuel Injectors

• Access the fuel injectors by removing the intake manifold if necessary.
• Visually inspect for any fuel leaks or carbon buildup.
• Use an ohmmeter to test for proper resistance in each injector; replace any that are out of specification.
• Clean or replace any clogged injectors using a professional injector cleaning service if necessary.

6. Verify Exhaust System

• Inspect the exhaust system, focusing on the area before and after the catalytic converter.
• Look for any visible leaks or damage that could affect O2 sensor readings.
• Repair any leaks found in the exhaust system.