why does my Ford F-150 13th Generation (2015-2020) check engine light come on and off

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

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

540 words

Problem Statement

Discover how to diagnose and fix the intermittent check engine light on your Ford F-150 (2015-2020). Step-by-step guide with symptoms and solutions.

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 the engine to cool before starting any repairs or inspections.

Symptoms

•Check engine light illuminated
•Occasional rough idle
•Decreased fuel efficiency
•Engine stalling during acceleration
•Unusual engine noises (e.g., knocking or pinging)
•Increased exhaust emissions

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored trouble codes.
2
Inspect the gas cap for proper closure; check for cracks or damage that could cause a leak.
3
Examine the engine air filter for cleanliness and blockage.
4
Test the battery voltage and connections to ensure proper electrical supply.
5
Check for vacuum leaks by inspecting hoses and gaskets around the intake manifold.
6
Inspect spark plugs and ignition coils for wear or damage.

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
•Screwdrivers
•Smoke machine (optional for vacuum leak testing)

Parts Required

•New gas cap (if defective)
•Spark plugs
•Ignition coils (if defective)
•Engine air filter

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored trouble codes.
2
Inspect the gas cap for proper closure; check for cracks or damage that could cause a leak.
3
Examine the engine air filter for cleanliness and blockage.
4
Test the battery voltage and connections to ensure proper electrical supply.
5
Check for vacuum leaks by inspecting hoses and gaskets around the intake manifold.
6
Inspect spark plugs and ignition coils for wear or damage.

Solution

1. Preparation

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

2. Address Fault Codes

If any trouble codes are identified, research the specific code to determine the related component.
Clear the codes using the OBD-II scanner and take the vehicle for a test drive to see if the light reappears.

3. Replace or Repair Defective Components

Gas Cap: If the gas cap is faulty, replace it with a new one. Ensure it's tightened properly after replacement.
Spark Plugs and Ignition Coils: If these components are worn, remove the old spark plugs using a socket set and replace them with new OEM or quality aftermarket plugs. Check the ignition coils for proper function and replace as necessary.
Air Filter: If the air filter is dirty, remove the air intake assembly, replace the air filter, and reassemble.

4. Check for Vacuum Leaks

Use a smoke machine or carburetor cleaner to identify leaks in vacuum lines. Replace any damaged hoses or gaskets.

5. Final Checks

Reconnect the battery.
Start the vehicle and monitor for any abnormal sounds or behaviors, as well as the check engine light status.