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

534 words

Problem Statement

Learn how to diagnose and fix the intermittent check engine light issue in Ford F-150 (2015-2020). 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 to avoid burns.

Symptoms

•Intermittent check engine light illumination
•Rough engine idle
•Decreased fuel efficiency
•Engine stalling or hesitation during acceleration
•Unusual engine noises (e.g., knocking or pinging)

Diagnostic Steps

1
Scan the vehicle’s onboard diagnostics (OBD-II) for error codes using an OBD-II scanner.
2
Record and interpret the retrieved error codes to identify potential issues.
3
Inspect the vehicle’s gas cap for proper sealing or damage, as a loose cap can trigger the check engine light.
4
Check for any visible leaks in the vacuum system, including hoses and gaskets.
5
Conduct a visual inspection of the ignition system components, including spark plugs and coils.
6
Monitor fuel pressure using a fuel pressure gauge to ensure it meets manufacturer specifications.

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
•Spark plug socket

Parts Required

•Oxygen sensor (if applicable)
•Spark plugs (if applicable)
•Ignition coils (if applicable)

Related Faults

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Diagnostic Steps

1
Scan the vehicle’s onboard diagnostics (OBD-II) for error codes using an OBD-II scanner.
2
Record and interpret the retrieved error codes to identify potential issues.
3
Inspect the vehicle’s gas cap for proper sealing or damage, as a loose cap can trigger the check engine light.
4
Check for any visible leaks in the vacuum system, including hoses and gaskets.
5
Conduct a visual inspection of the ignition system components, including spark plugs and coils.
6
Monitor fuel pressure using a fuel pressure gauge to ensure it meets manufacturer specifications.

Solution

1. Preparation

Gather necessary tools and parts for the repair.
Disconnect the negative terminal of the battery to prevent electrical shorts during the repair process.

2. Addressing Error Codes

Based on the retrieved error codes, identify the specific component that may need repair or replacement (e.g., oxygen sensor, catalytic converter, or mass airflow sensor).
If the error code relates to a specific sensor, remove the affected sensor using a socket set.

3. Repair or Replace Components

For Oxygen Sensor Replacement:
- Ensure the engine is cool.
- Disconnect the electrical connector from the old sensor.
- Remove the sensor using an oxygen sensor socket.
- Install the new sensor, ensuring it is tightened to the manufacturer’s torque specifications (typically 30 ft-lbs).
For Spark Plug Replacement:
- Remove the ignition coil(s) by unbolting them and disconnecting the electrical connector.
- Unscrew the old spark plugs using a spark plug socket and replace them with new ones, ensuring they are gapped according to manufacturer specifications (usually 0.052 inches).
- Reinstall the ignition coils.

4. Reconnect Battery and Clear Codes

Reconnect the negative battery terminal.
Use the OBD-II scanner to clear any stored codes from the vehicle’s computer.

5. Final Inspection

Start the engine and ensure it runs smoothly without any warning lights.
Conduct a test drive to confirm that the check engine light does not reappear.