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

511 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 the battery before working on electrical systems.
•Allow engine to cool before inspecting or removing components.

Symptoms

•Flashing check engine light
•Engine misfire or rough idling
•Decreased power or acceleration
•Increased fuel consumption
•Unusual engine noises (e.g., sputtering)

Diagnostic Steps

1
Scan the vehicle's onboard diagnostics (OBD-II) system for trouble codes.
2
Inspect the ignition system components (spark plugs, wires, coils) for wear or damage.
3
Check for vacuum leaks in the intake manifold or associated hoses.
4
Examine fuel system components, including fuel injectors and fuel pressure.
5
Test the exhaust system for blockages or leaks that could affect sensor readings.

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
•Injector cleaning kit
•Smoke machine (optional)

Parts Required

•Spark plugs
•Ignition coils
•Fuel filter
•Fuel injectors (if necessary)
•Vacuum hoses (if damaged)

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Diagnostic Steps

1
Scan the vehicle's onboard diagnostics (OBD-II) system for trouble codes.
2
Inspect the ignition system components (spark plugs, wires, coils) for wear or damage.
3
Check for vacuum leaks in the intake manifold or associated hoses.
4
Examine fuel system components, including fuel injectors and fuel pressure.
5
Test the exhaust system for blockages or leaks that could affect sensor readings.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the battery to prevent electrical shorts.
Ensure the vehicle is on a level surface with adequate space to work.

2. Address Ignition System Issues

Sub-step 1: Remove engine cover if applicable.
Sub-step 2: Inspect spark plugs for wear; replace if necessary (use OEM specifications for gap size).
Sub-step 3: Check ignition coils for cracks or signs of arcing; replace faulty coils.
Tools Required: Socket set, spark plug gap tool, torque wrench.

3. Inspect Fuel System

Sub-step 1: Check fuel pressure with a fuel pressure gauge; compare readings to manufacturer specifications.
Sub-step 2: Clean or replace clogged fuel injectors using an appropriate injector cleaner.
Sub-step 3: Replace fuel filter if it hasn't been changed per maintenance schedule.
Tools Required: Fuel pressure gauge, injector cleaning kit, socket set.

4. Check for Vacuum Leaks

Sub-step 1: Visually inspect all vacuum hoses for cracks or disconnections.
Sub-step 2: Use a smoke machine or carburetor cleaner to identify leaks.
Sub-step 3: Replace any damaged hoses and ensure all connections are secure.
Tools Required: Smoke machine (optional), carburetor cleaner, hose clamps.

5. Examine Exhaust System

Sub-step 1: Inspect the exhaust system for any blockages or visible damage.
Sub-step 2: Check the oxygen sensors for proper functionality; replace if necessary.
Tools Required: O2 sensor socket, exhaust inspection mirror.