what causes my Ford Explorer's check engine light to come on intermittently

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

528 words

Problem Statement

Learn how to diagnose and fix intermittent check engine light issues in Ford Explorer. 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

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before opening any components.

Symptoms

•Intermittent illumination of the check engine light
•Slight rough idle when the light is on
•Occasional loss of power during acceleration
•Unusual engine noises, such as knocking or pinging
•Fluctuating fuel economy
•Engine stalling at low speeds

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored trouble codes.
2
Check fuel levels and quality, ensuring proper octane rating and absence of water or contaminants.
3
Inspect the gas cap for proper sealing and any signs of wear or damage.
4
Perform a visual inspection of the engine for loose or damaged hoses, wires, or connectors.
5
Test the battery voltage and charging system to ensure proper electrical function.
6
Examine the ignition system components, including spark plugs and ignition coils, for wear.
7
Check for vacuum leaks using a smoke machine or by spraying carburetor cleaner around intake manifold 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
•Multimeter
•Socket set
•Torque wrench
•Smoke machine

Parts Required

•New spark plugs (if necessary)
•Replacement ignition coils (if necessary)
•New gas cap (if necessary)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored trouble codes.
2
Check fuel levels and quality, ensuring proper octane rating and absence of water or contaminants.
3
Inspect the gas cap for proper sealing and any signs of wear or damage.
4
Perform a visual inspection of the engine for loose or damaged hoses, wires, or connectors.
5
Test the battery voltage and charging system to ensure proper electrical function.
6
Examine the ignition system components, including spark plugs and ignition coils, for wear.
7
Check for vacuum leaks using a smoke machine or by spraying carburetor cleaner around intake manifold gaskets.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the negative battery terminal.
Allow the engine to cool completely before starting work.

2. Address Error Codes

Using the OBD-II scanner, retrieve and document trouble codes.
If codes indicate specific components (e.g., oxygen sensor, mass airflow sensor), proceed to inspect and replace as needed.

3. Inspect and Replace the Gas Cap

Check the gas cap for cracks or damage.
If defective, replace with a new gas cap and ensure it clicks securely when tightened.

4. Check and Replace Ignition Components

Remove the ignition coils and spark plugs if wear is present.
Replace spark plugs with OEM or equivalent parts, ensuring proper gap settings.
Reinstall ignition coils securely.

5. Inspect and Repair Vacuum Leaks

Use a smoke machine to introduce smoke into the intake system.
Identify and repair any leaks in hoses or gaskets as necessary.

6. Test and Repair Electrical System

Use a multimeter to check battery voltage and alternator output; replace the battery or alternator if readings are below specifications.
Inspect all wiring and connectors for corrosion or damage, repairing as necessary.