what causes a check engine light on my Ford Explorer to stay on?

Ford Explorer Sixth Generation (2020-present)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

550 words

Problem Statement

Learn how to diagnose and fix the check engine light issue in your Ford Explorer. Step-by-step guide with symptoms, diagnostic steps, 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 components.
•Allow the engine to cool before inspecting the exhaust system.

Symptoms

•Check engine light illuminated continuously
•Decreased engine performance or power
•Rough idling or stalling during operation
•Poor fuel economy
•Increased exhaust emissions
•Unusual noises from the engine compartment

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; a loose or damaged cap can trigger the check engine light.
3
Check engine oil and coolant levels to ensure they are within acceptable ranges.
4
Examine the exhaust system for leaks, which can affect emissions readings.
5
Inspect the air filter for clogs or restrictions that can impact engine performance.
6
Verify the condition of spark plugs and ignition coils for wear or damage.

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
•Screwdriver set
•Pliers

Parts Required

•Gas cap (if faulty)
•Spark plugs
•Ignition coils (if needed)
•Air filter

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; a loose or damaged cap can trigger the check engine light.
3
Check engine oil and coolant levels to ensure they are within acceptable ranges.
4
Examine the exhaust system for leaks, which can affect emissions readings.
5
Inspect the air filter for clogs or restrictions that can impact engine performance.
6
Verify the condition of spark plugs and ignition coils for wear or damage.

Solution

1. Preparation

Gather tools and materials required for the repair.
Ensure the vehicle is parked on a level surface and the engine is cool.
Disconnect the negative battery terminal to prevent electrical shorts during repairs.

2. Address Fault Codes

Sub-step 1: Record all OBD-II error codes from the scanner.
Sub-step 2: Research the meaning of the codes to determine the affected systems or components.
Sub-step 3: Clear the error codes using the scanner and take the vehicle for a test drive to check if the check engine light returns.

3. Inspect and Replace Components

Sub-step 1: If the gas cap is faulty, replace it with a new one rated for your specific Ford Explorer model.
Sub-step 2: If error codes indicate issues with spark plugs or ignition coils, remove the old components and install new ones. Ensure to torque the spark plugs to the manufacturer's specifications.
Sub-step 3: For air filter issues, remove the air intake duct, replace the air filter, and reassemble.

4. Repair Exhaust Leaks

Sub-step 1: Inspect exhaust pipes, catalytic converter, and muffler for visible damage or rust.
Sub-step 2: If leaks are found, replace damaged sections of the exhaust system using appropriate gaskets and clamps.
Sub-step 3: Recheck for leaks after repairs by running the engine and listening for unusual sounds.