why does my Ford F-150 13th Generation (2015-2020) check engine light flash while driving

Ford F-150 13th Generation (2015-2020)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

491 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 a flashing check engine light in a 2015-2020 Ford F-150. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Engine

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

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

Symptoms

•Flashing check engine light
•Rough engine idle
•Decreased engine performance
•Poor fuel economy
•Engine stalling or hesitation during acceleration

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific trouble codes.
2
Inspect ignition system components, including spark plugs, ignition coils, and wiring for damage or wear.
3
Check fuel system pressure and inspect fuel injectors for proper operation.
4
Inspect the air intake system for obstructions or leaks.
5
Examine exhaust system for blockage or excessive back pressure.
6
Assess engine vacuum for leaks using a vacuum gauge.

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
•Socket set
•Torque wrench
•Fuel pressure gauge
•Vacuum gauge

Parts Required

•Spark plugs
•Ignition coils (if necessary)
•Fuel filter (if necessary)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific trouble codes.
2
Inspect ignition system components, including spark plugs, ignition coils, and wiring for damage or wear.
3
Check fuel system pressure and inspect fuel injectors for proper operation.
4
Inspect the air intake system for obstructions or leaks.
5
Examine exhaust system for blockage or excessive back pressure.
6
Assess engine vacuum for leaks using a vacuum gauge.

Solution

1. Preparation

Gather tools and parts needed for repairs.
Disconnect the battery to ensure safety during repairs.
Allow the engine to cool down before proceeding.

2. Replace Faulty Spark Plugs

Remove the ignition coil covers using a socket set.
Disconnect the ignition coils from the spark plugs.
Remove and replace spark plugs with manufacturer-recommended specifications (e.g., NGK or Motorcraft).
Reinstall ignition coils and ensure they are securely connected.

3. Inspect and Replace Ignition Coils (if necessary)

If any coils are found to be faulty during inspection, remove them using a socket set.
Install new ignition coils, ensuring they are seated correctly.
Torque the bolts to the manufacturer’s specifications (typically 10-15 ft-lbs).

4. Check Fuel System

Use a fuel pressure gauge to test the fuel pressure; it should match manufacturer specifications (usually around 60-65 psi).
If pressure is low, check the fuel pump, filter, and injectors for blockages or failures.
Replace any faulty components as needed.

5. Inspect Air Intake and Exhaust

Check the air filter and intake hose for blockages; replace the air filter if dirty.
Inspect the exhaust system for any signs of blockage or damage.
Clear any obstructions found during the inspection.