why does my Ford F-150’s 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

539 words

Problem Statement

Learn how to diagnose and fix the check engine light issue in your Ford F-150. 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 components.
•Allow the engine to cool before performing any inspections or repairs.

Symptoms

•Check engine light illuminated
•Rough idle or engine misfire
•Decreased fuel efficiency
•Unusual engine noises
•Emission test failure (if applicable)
•Noticeable changes in engine performance (e.g., loss of power)

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 and condition, as a loose or damaged cap can trigger the check engine light.
3
Check the vehicle's air filter for blockage or dirtiness.
4
Inspect the ignition system components (spark plugs, coils) for wear or damage.
5
Examine the exhaust system for leaks or blockages.
6
Test the fuel pressure to ensure the fuel system is operating correctly.

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
•Screwdrivers

Parts Required

•New spark plugs
•Ignition coils (if needed)
•Fuel filter (if needed)
•Gas cap (if faulty)

Related Faults

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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 and condition, as a loose or damaged cap can trigger the check engine light.
3
Check the vehicle's air filter for blockage or dirtiness.
4
Inspect the ignition system components (spark plugs, coils) for wear or damage.
5
Examine the exhaust system for leaks or blockages.
6
Test the fuel pressure to ensure the fuel system is operating correctly.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is on a flat surface and the engine is cool.
Disconnect the negative battery terminal to prevent electrical shorts.

2. Address Error Codes

Sub-step 1: Use the OBD-II scanner to read the error codes and document them.
Sub-step 2: Research the codes to determine the related components or systems.
Sub-step 3: Clear the error codes and observe if the check engine light returns.

3. Inspect and Replace Faulty Components

Sub-step 1: If the gas cap is faulty, replace it with a new OEM or quality aftermarket cap.
Sub-step 2: If spark plugs are worn, remove the old plugs using a socket set, and install new plugs with the specified gap.
Sub-step 3: Replace any damaged ignition coils by disconnecting electrical connectors and removing securing bolts.

4. Check Fuel System

Sub-step 1: Connect a fuel pressure gauge to the fuel rail, and turn the ignition to the "ON" position to check pressure readings.
Sub-step 2: If pressure is low, inspect the fuel pump and fuel filter for clogs or failures, and replace as necessary.

5. Examine Exhaust System

Sub-step 1: Visually inspect the exhaust system for any signs of rust, holes, or loose connections.
Sub-step 2: Repair or replace damaged sections of the exhaust as needed.

Tools Required:

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

Parts Required:

New spark plugs
Ignition coils (if needed)
Fuel filter (if needed)
Gas cap (if faulty)

Estimated Repair Time: 2-4 hours

Safety Warnings:

Disconnect the battery before working on electrical components.
Allow the engine to cool before performing any inspections or repairs.