how to fix P0174 code on Ford Explorer Fifth Generation (2011-2019)

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

Error Code: P0174

4 min read

610 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix P0174 fuel system issue in Ford Explorer (2011-2019). Step-by-step guide with diagnostic procedures and repair instructions.

Error Code

P0174

Affected Component

Fuel System

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before opening any components.

Symptoms

•Check engine light illuminated
•Rough idle
•Loss of power during acceleration
•Decreased fuel economy
•Engine stalling or hesitation
•Increased emissions

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm the P0174 code.
2
Inspect vacuum lines for any leaks or damage.
3
Check the mass airflow (MAF) sensor for proper operation and cleanliness.
4
Inspect the fuel pressure using a fuel pressure gauge.
5
Test the oxygen sensors to ensure they are functioning correctly.
6
Examine the intake manifold gaskets for leaks.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Vacuum gauge
•Fuel pressure gauge
•MAF sensor cleaner
•Oxygen sensor socket
•Torque wrench
•Basic hand tools (sockets, wrenches)

Parts Required

•Replacement vacuum hoses
•MAF sensor (if needed)
•Fuel filter (if needed)
•Oxygen sensors (if needed)
•Intake manifold gaskets

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm the P0174 code.
2
Inspect vacuum lines for any leaks or damage.
3
Check the mass airflow (MAF) sensor for proper operation and cleanliness.
4
Inspect the fuel pressure using a fuel pressure gauge.
5
Test the oxygen sensors to ensure they are functioning correctly.
6
Examine the intake manifold gaskets for leaks.

Solution

1. Preparation

Gather all tools and parts needed for the repair.
Ensure the vehicle is parked on a flat surface and the engine is cool.
Disconnect the battery to prevent electrical shock.

2. Inspect and Replace Vacuum Lines

Sub-steps:
- Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
- Replace any damaged or cracked vacuum lines with new, OEM-spec hoses.

3. Clean or Replace the MAF Sensor

Sub-steps:
- Locate the MAF sensor on the air intake duct.
- Disconnect the electrical connector and remove the sensor.
- Clean the MAF sensor using MAF sensor cleaner; do not touch the sensor element.
- If the MAF sensor is faulty, replace it with a new one and reinstall.

4. Check and Adjust Fuel Pressure

Sub-steps:
- Connect a fuel pressure gauge to the fuel rail test port.
- Start the engine and check the fuel pressure reading against the manufacturer's specifications (typically around 50-60 psi).
- If pressure is low, check the fuel pump and fuel filter for issues. Replace as necessary.

5. Inspect and Replace Oxygen Sensors

Sub-steps:
- Locate the oxygen sensors on the exhaust system, typically before and after the catalytic converter.
- Disconnect the electrical connectors and remove the sensors using an oxygen sensor socket.
- Install new oxygen sensors, ensuring they are torqued to manufacturer specifications.

6. Replace Intake Manifold Gaskets

Sub-steps:
- Remove any components obstructing access to the intake manifold.
- Disconnect the intake manifold from the engine block and remove it carefully.
- Replace the old gaskets with new ones, ensuring a proper fit.
- Reinstall the intake manifold and torque the bolts to the manufacturer’s specifications.