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

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

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

512 words

Problem Statement

Learn how to diagnose and fix the check engine light issue on your 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 before performing any repairs to avoid burns.

Symptoms

•Check engine light illuminated
•Engine stalling or misfiring
•Decreased fuel efficiency
•Rough idle at low speeds
•Increased emissions
•Unusual engine noises (e.g., knocking or pinging)

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific issues.
2
Check the gas cap for proper sealing; a loose or damaged cap can trigger the check engine light.
3
Inspect the engine air filter for cleanliness and proper installation.
4
Examine the spark plugs and ignition coils for wear or damage.
5
Test fuel pressure to ensure the fuel pump and filters are functioning correctly.
6
Inspect for vacuum leaks in hoses and gaskets.

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
•Screwdrivers
•Vacuum gauge

Parts Required

•Spark plugs
•Ignition coils (if needed)
•Fuel filter (if needed)
•Vacuum hoses (if damaged)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific issues.
2
Check the gas cap for proper sealing; a loose or damaged cap can trigger the check engine light.
3
Inspect the engine air filter for cleanliness and proper installation.
4
Examine the spark plugs and ignition coils for wear or damage.
5
Test fuel pressure to ensure the fuel pump and filters are functioning correctly.
6
Inspect for vacuum leaks in hoses and gaskets.

Solution

1. Preparation

Gather tools and parts needed for the repair.
Disconnect the vehicle's battery (negative terminal) to ensure safety during repairs.

2. Address Fault Codes

Sub-step 2.1: Use the OBD-II scanner to retrieve fault codes.
Sub-step 2.2: Research the codes to determine the specific component or system affected.
Sub-step 2.3: Clear the codes and test drive the vehicle to see if the check engine light returns.

3. Replace Faulty Components

Sub-step 3.1: If the issue is with the spark plugs:
- Remove the ignition coils using a socket set.
- Replace old spark plugs with new ones of the manufacturer’s specification.
- Reinstall the ignition coils and torque them to the specified value (typically 10-15 ft-lbs).
Sub-step 3.2: If vacuum leaks are detected:
- Inspect hoses visually for cracks or breaks.
- Replace any damaged hoses with OEM parts.
Sub-step 3.3: If the fuel system is at fault:
- Replace the fuel filter if it is clogged.
- Check the fuel pump for proper operation and replace if necessary.

4. Final Assembly

Reconnect the vehicle's battery.
Start the engine and check for any warning lights.