why does my Ford F-150 13th Generation (2015-2020) check engine light stay on after resetting

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

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

558 words

Problem Statement

Learn how to diagnose and fix the check engine light issue on 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

•Always disconnect the battery before working on electrical systems.
•Allow the engine to cool completely before performing any repairs.

Symptoms

•Check engine light remains illuminated after reset
•Possible rough engine idle
•Decreased fuel efficiency
•Occasional stalling or hesitation during acceleration
•Increased emissions detected

Diagnostic Steps

1
Scan the vehicle's onboard diagnostic system using an OBD-II scanner to retrieve any stored error codes.
2
Inspect the vehicle's gas cap to ensure it is properly sealed and not damaged.
3
Check for any vacuum leaks in the intake system that might affect engine performance.
4
Test the battery and charging system to ensure proper voltage levels.
5
Examine the vehicle’s sensors for malfunctions or failures.
6
Verify that all previous repairs have been properly completed.

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
•Multimeter
•Basic socket set
•Screwdrivers
•Smoke machine

Parts Required

•Gas cap
•Vacuum hoses
•Replacement sensors

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Diagnostic Steps

1
Scan the vehicle's onboard diagnostic system using an OBD-II scanner to retrieve any stored error codes.
2
Inspect the vehicle's gas cap to ensure it is properly sealed and not damaged.
3
Check for any vacuum leaks in the intake system that might affect engine performance.
4
Test the battery and charging system to ensure proper voltage levels.
5
Examine the vehicle’s sensors for malfunctions or failures.
6
Verify that all previous repairs have been properly completed.

Solution

1. Preparation

Gather tools and parts needed for the repair.
Ensure the vehicle is parked on a flat surface and the engine is cool.
Disconnect the battery to ensure safety while working on electrical components.

2. Retrieve and Analyze Codes

Connect the OBD-II scanner to the vehicle's diagnostic port.
Turn on the ignition without starting the engine and read the stored error codes.
Write down the codes for reference and clear the codes.

3. Inspect and Replace Components

Gas Cap Inspection:
- Remove the gas cap and inspect for cracks or damage.
- Replace with a new gas cap if necessary.
Vacuum Leak Inspection:
- Visually inspect hoses and connections for cracks or disconnections.
- Use a smoke machine or carburetor cleaner to detect leaks at intake manifold and vacuum lines.
- Replace any damaged hoses or gaskets.
Sensor Testing:
- Test the O2 sensors and MAF sensor using a multimeter to check for proper function.
- Replace any faulty sensors based on manufacturer specifications.

4. Reconnect Battery and Reset System

Reconnect the battery terminals, ensuring they are secure.
Clear any error codes again using the OBD-II scanner.

5. Final Inspection

Start the engine and allow it to reach operating temperature.
Monitor the dashboard for any warning lights and listen for unusual sounds.