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

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

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

612 words

Problem Statement

Learn how to diagnose and fix the 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 the battery before working on electrical systems.
•Allow the engine to cool before opening the hood or working on any components.

Symptoms

•Check engine light illuminated
•Rough idle or stalling
•Decreased fuel efficiency
•Poor engine performance or loss of power
•Unusual engine noises (e.g., knocking or pinging)
•Increased emissions

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific trouble codes.
2
Inspect the gas cap for proper sealing; a loose or damaged cap can cause a CEL.
3
Check the engine oil level and condition; low oil can lead to performance issues.
4
Examine the air intake system for leaks or blockages that could affect airflow.
5
Test the fuel pressure to ensure the fuel system is supplying adequate pressure.
6
Inspect the ignition system, including spark plugs and coils, for wear or failure.

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

Parts Required

•Spark plugs (if needed)
•Air filter (if needed)
•Engine oil (if needed)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific trouble codes.
2
Inspect the gas cap for proper sealing; a loose or damaged cap can cause a CEL.
3
Check the engine oil level and condition; low oil can lead to performance issues.
4
Examine the air intake system for leaks or blockages that could affect airflow.
5
Test the fuel pressure to ensure the fuel system is supplying adequate pressure.
6
Inspect the ignition system, including spark plugs and coils, for wear or failure.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the battery to ensure safety while working on electrical components.
Allow the engine to cool before beginning work.

2. Addressing Error Codes

Sub-steps:
1. Connect the OBD-II scanner to the vehicle's diagnostic port.
2. Record the error codes displayed and refer to a service manual for code definitions.
3. Clear the codes and perform a test drive to see if they return.

3. Inspecting the Gas Cap

Sub-steps:
1. Remove the gas cap and visually inspect for cracks or damage.
2. Clean the gas cap and the filler neck to ensure a proper seal.
3. Reinstall the gas cap, ensuring it clicks securely into place.

4. Checking Engine Oil

Sub-steps:
1. Remove the dipstick and wipe it clean.
2. Reinsert and remove the dipstick again to check the oil level.
3. If low, add the recommended oil type to reach the correct level.

5. Inspecting the Air Intake System

Sub-steps:
1. Open the hood and visually inspect the air intake hoses for cracks or disconnections.
2. Remove the air filter and check for dirt or damage; replace if necessary.
3. Reassemble the intake system ensuring all clamps and connections are tight.

6. Testing Fuel Pressure

Sub-steps:
1. Locate the fuel pressure test port on the fuel rail.
2. Connect a fuel pressure gauge to the port.
3. Turn the ignition to the "On" position (without starting) and check the pressure readings against specifications in the service manual.

7. Inspecting the Ignition System

Sub-steps:
1. Remove spark plug wires and inspect for cracks or corrosion.
2. Check spark plugs for wear; replace if they appear worn or fouled.
3. Test ignition coils using a multimeter for proper resistance values.

Tools Required:

OBD-II scanner
Fuel pressure gauge
Socket set
Torque wrench
Multimeter

Parts Required:

Spark plugs (if needed)
Air filter (if needed)
Engine oil (if needed)

Estimated Repair Time: 2-4 hours

Safety Warnings:

Disconnect the battery before working on electrical systems.
Allow the engine to cool before opening the hood or working on any components.