why does my Ford Explorer's check engine light turn on and off

Ford Explorer Sixth Generation (2020-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

501 words

Problem Statement

Learn how to diagnose and fix the intermittent check engine light issue 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 battery before working on electrical systems.
•Allow engine to cool before opening any components.

Symptoms

•Check engine light illuminated intermittently
•Possible rough idle or engine stalling
•Reduced engine performance or power loss
•Fluctuating fuel economy
•Increased emissions detected during vehicle inspections

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific fault codes.
2
Check the vehicle’s fluid levels (oil, coolant, transmission fluid) for proper maintenance.
3
Inspect the gas cap to ensure it is properly sealed and not damaged.
4
Examine the spark plugs and ignition coils for wear or damage.
5
Perform a visual inspection of the exhaust system for any leaks or blockages.
6
Test the battery and charging system to ensure proper voltage and connections.
7
Monitor engine data parameters while driving to detect any abnormal readings.

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
•Multimeter
•Spark plug socket

Parts Required

•Spark plugs
•Ignition coils (if necessary)
•Gas cap (if damaged)
•Exhaust components (if damaged)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific fault codes.
2
Check the vehicle’s fluid levels (oil, coolant, transmission fluid) for proper maintenance.
3
Inspect the gas cap to ensure it is properly sealed and not damaged.
4
Examine the spark plugs and ignition coils for wear or damage.
5
Perform a visual inspection of the exhaust system for any leaks or blockages.
6
Test the battery and charging system to ensure proper voltage and connections.
7
Monitor engine data parameters while driving to detect any abnormal readings.

Solution

1. Preparation

Gather all necessary tools and parts.
Disconnect the battery to ensure safety during repairs.
Raise the vehicle if necessary for better access.

2. Inspect and Replace Spark Plugs

Remove the ignition coil covers using a socket wrench.
Disconnect the wiring harness from each ignition coil.
Unscrew each spark plug using a spark plug socket.
Inspect spark plugs for wear; replace them if necessary. Ensure proper gap size (usually 0.054 inches for Ford engines).
Reinstall new spark plugs and reconnect ignition coils.

3. Gas Cap Inspection and Replacement

Inspect the gas cap for cracks or damage; replace if necessary.
Ensure the gas cap clicks when tightened to confirm a proper seal.

4. Exhaust System Inspection

Visually inspect the exhaust pipes, catalytic converter, and muffler for any signs of damage or leaks.
Replace any damaged components found during the inspection.

5. Battery and Charging System Check

Use a multimeter to check the battery voltage (should be around 12.6 volts when off, 13.7-14.7 volts when running).
Clean battery terminals and ensure tight connections.
Replace the battery if voltage is consistently low.