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

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

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

594 words

Problem Statement

Learn how to diagnose and fix the check engine light issue on your 2015-2020 Ford F-150. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Engine

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to prevent shocks or shorts.
•Allow the engine to cool down before inspecting or working on engine components.

Symptoms

•Check engine light is continuously illuminated
•Possible rough engine idle
•Decreased fuel efficiency
•Engine stalling or misfiring
•Increased emissions during operation
•Unusual engine noises (e.g., knocking or pinging)

Diagnostic Steps

1
Scan the vehicle’s OBD-II system using an OBD-II scanner to retrieve any stored error codes.
2
Inspect the gas cap to ensure it is tight and not damaged; a loose or faulty gas cap can trigger the check engine light.
3
Check the vehicle’s fluid levels, including engine oil, coolant, and transmission fluid, for any irregularities.
4
Visually inspect the engine for any signs of leaks, damaged hoses, or disconnected vacuum lines.
5
Test the battery voltage and condition, as a weak battery can cause various electrical issues.
6
Review the vehicle's maintenance history to determine if any recent repairs or changes could be related to the issue.

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
•Oxygen sensor socket
•Spark plug socket
•Torque wrench
•Basic hand tools (wrench set, screwdrivers)

Parts Required

•Oxygen sensors (if faulty)
•Spark plugs (if worn or damaged)
•Catalytic converter (if needed)

Related Faults

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Diagnostic Steps

1
Scan the vehicle’s OBD-II system using an OBD-II scanner to retrieve any stored error codes.
2
Inspect the gas cap to ensure it is tight and not damaged; a loose or faulty gas cap can trigger the check engine light.
3
Check the vehicle’s fluid levels, including engine oil, coolant, and transmission fluid, for any irregularities.
4
Visually inspect the engine for any signs of leaks, damaged hoses, or disconnected vacuum lines.
5
Test the battery voltage and condition, as a weak battery can cause various electrical issues.
6
Review the vehicle's maintenance history to determine if any recent repairs or changes could be related to the issue.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the vehicle's negative battery terminal to ensure safety.
Ensure the vehicle is on a flat surface and adequately supported if lifting is necessary.

2. Retrieve and Interpret Codes

Reconnect the OBD-II scanner and turn the ignition to the "On" position without starting the engine.
Record any trouble codes displayed on the scanner.
Research and interpret the codes to identify potential issues.

3. Inspect and Repair Identified Issues

For codes related to the oxygen sensors:
- Tools: Oxygen sensor socket, wrench.
- Steps:
  - Locate the faulty oxygen sensor.
  - Unplug the sensor connector.
  - Use the oxygen sensor socket to remove the sensor.
  - Install the new sensor and reconnect the wiring.
For codes related to misfires:
- Tools: Spark plug socket, torque wrench.
- Steps:
  - Remove the spark plugs and inspect for wear or damage.
  - Replace with new spark plugs if necessary, following proper torque specifications (typically around 13 lb-ft).
For codes related to the catalytic converter:
- Tools: Wrench set, exhaust pipe cutter (if needed).
- Steps:
  - Inspect the catalytic converter for physical damage or clogs.
  - Replace as necessary, ensuring to seal all connections properly.

4. Reset the Check Engine Light

Reconnect the negative battery terminal.
Use the OBD-II scanner to clear any stored codes.
Start the engine to verify the check engine light does not return.