why does my Ford F-150 13th Generation (2015-2020) check engine light keep flashing

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

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

553 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 on your Ford F-150 (2015-2020). Step-by-step guide with symptoms, diagnostics, 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 the engine to cool before opening the hood or working on hot components.

Symptoms

•Fluctuating engine RPM
•Rough idle
•Loss of power during acceleration
•Poor fuel economy
•Engine misfires
•Increased emissions

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific malfunction codes.
2
Inspect the ignition system components, including spark plugs and ignition coils, for wear or damage.
3
Check fuel system pressure with a fuel pressure gauge to ensure proper fuel delivery.
4
Examine the air intake system for leaks or blockages.
5
Inspect exhaust system for any obstructions or damage.
6
Verify the condition of the engine's sensors (e.g., MAF, O2 sensors) with a multimeter.

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
•Multimeter

Parts Required

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

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific malfunction codes.
2
Inspect the ignition system components, including spark plugs and ignition coils, for wear or damage.
3
Check fuel system pressure with a fuel pressure gauge to ensure proper fuel delivery.
4
Examine the air intake system for leaks or blockages.
5
Inspect exhaust system for any obstructions or damage.
6
Verify the condition of the engine's sensors (e.g., MAF, O2 sensors) with a multimeter.

Solution

1. Preparation

Gather tools and parts.
Disconnect the battery to ensure safety.
Allow the engine to cool if it has been running.

2. Inspect and Replace Spark Plugs

Remove the spark plug wires or ignition coil packs.
Use a socket wrench to remove the spark plugs.
Inspect the spark plugs for wear, carbon buildup, or damage.
Replace with new spark plugs that meet OEM specifications (check the gap setting).
Reinstall the spark plugs and reconnect the ignition components.

3. Check and Replace Ignition Coils (if necessary)

Remove the ignition coils by unscrewing and unplugging the electrical connectors.
Inspect the coils for cracks or signs of wear.
Replace faulty ignition coils with new ones that meet OEM specifications.
Reinstall and reconnect the ignition coils.

4. Test Fuel System

Connect a fuel pressure gauge to the fuel line.
Turn the ignition to the "ON" position without starting the engine to check fuel pressure.
If pressure is below specifications, inspect and replace the fuel pump or fuel filter if necessary.

5. Inspect Air Intake System

Remove the air intake duct and inspect for any obstructions or leaks.
Replace any damaged hoses and ensure the air filter is clean or replace it if necessary.

6. Examine Exhaust System

Inspect the exhaust system for any visible damage or blockage.
Check for a clogged catalytic converter; if suspect, perform a backpressure test.