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

3 min read

490 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 symptoms, diagnostic steps, 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 completely before inspecting components.

Symptoms

•Check engine light illuminated
•Rough idle or engine misfire
•Decreased engine performance or power loss
•Poor fuel economy
•Engine stalling
•Increased emissions

Diagnostic Steps

1
Scan the vehicle's OBD-II system using a compatible scanner to retrieve any stored error codes.
2
Inspect the gas cap for damage or improper sealing which could trigger a code.
3
Check engine oil and coolant levels to rule out low fluid conditions.
4
Examine spark plugs and ignition coils for wear or damage.
5
Inspect fuel system components, including fuel injectors and fuel pressure.
6
Evaluate the exhaust system for leaks or issues, especially with the catalytic converter.

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 damaged)
•Fuel filter
•Fuel pump (if needed)
•Catalytic converter (if necessary)

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Diagnostic Steps

1
Scan the vehicle's OBD-II system using a compatible scanner to retrieve any stored error codes.
2
Inspect the gas cap for damage or improper sealing which could trigger a code.
3
Check engine oil and coolant levels to rule out low fluid conditions.
4
Examine spark plugs and ignition coils for wear or damage.
5
Inspect fuel system components, including fuel injectors and fuel pressure.
6
Evaluate the exhaust system for leaks or issues, especially with the catalytic converter.

Solution

1. Preparation

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

2. Addressing OBD-II Codes

Sub-steps:
- Clear the stored codes from the OBD-II scanner.
- Take the vehicle for a test drive to see if the check engine light reappears.
- If codes return, document them for further investigation.

3. Inspecting and Replacing Spark Plugs

Sub-steps:
- Remove the engine cover if applicable to access the spark plugs.
- Disconnect the ignition coils and remove them using a socket set.
- Unscrew and remove old spark plugs.
- Install new spark plugs (ensure correct gap settings are followed).
- Reattach the ignition coils and cover.

4. Fuel System Inspection and Repair

Sub-steps:
- Inspect fuel injectors for clogs; clean or replace as needed.
- Check fuel pressure using a fuel pressure gauge; replace fuel pump if pressure is below specifications.
- Ensure fuel filter is clean and replace if necessary.

5. Exhaust System Check

Sub-steps:
- Visually inspect the exhaust system for any leaks or damage.
- Test the catalytic converter with a backpressure gauge; replace if backpressure is excessive.

Tools Required:

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

Parts Required:

Spark plugs
Ignition coils (if damaged)
Fuel filter
Fuel pump (if needed)
Catalytic converter (if necessary)

Estimated Repair Time: 2-4 hours

Safety Warnings:

Disconnect the battery before working on electrical systems.
Allow the engine to cool completely before inspecting components.