why does my Ford Explorer Fifth Generation (2011-2019) check engine light come on intermittently?

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

548 words

Problem Statement

Discover the causes and solutions for intermittent check engine light on Ford Explorer 2011-2019. Step-by-step diagnostic and repair guide.

Affected Component

Engine

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on the ignition system.
•Allow the engine to cool before inspecting the fuel system or removing components.

Symptoms

•Check engine light illuminated
•Rough idle at startup
•Decreased fuel efficiency
•Unusual engine noises
•Occasional engine stalling
•Fluctuating RPMs during acceleration

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; replace if damaged or loose.
3
Check engine vacuum for leaks using a smoke machine or soapy water method.
4
Examine the spark plugs and ignition coils for wear or damage.
5
Test the fuel pressure using a fuel pressure gauge to ensure proper levels.
6
Inspect the exhaust system for any blockages or leaks.

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
•Fuel pressure gauge
•Vacuum gauge
•Smoke machine (optional)

Parts Required

•OEM gas cap (if necessary)
•Spark plugs (if worn)
•Ignition coils (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; replace if damaged or loose.
3
Check engine vacuum for leaks using a smoke machine or soapy water method.
4
Examine the spark plugs and ignition coils for wear or damage.
5
Test the fuel pressure using a fuel pressure gauge to ensure proper levels.
6
Inspect the exhaust system for any blockages or leaks.

Solution

1. Preparation

Gather tools such as an OBD-II scanner, socket set, fuel pressure gauge, and vacuum gauge.
Ensure the vehicle is parked on a flat surface and the engine is cool.

2. Scan for Error Codes

Connect the OBD-II scanner to the vehicle’s diagnostic port.
Turn the ignition to the "On" position without starting the engine.
Record any error codes and research their meanings for targeted diagnosis.

3. Inspect and Replace the Gas Cap

Check the gas cap for cracks or wear.
If damaged, replace it with a new OEM gas cap.
Ensure it clicks securely when closed.

4. Check Ignition System

Remove the spark plugs using a socket wrench.
Inspect each spark plug for carbon buildup or wear; replace if necessary.
Replace ignition coils if any are found to be faulty or worn.

5. Test Fuel System

Attach the fuel pressure gauge to the fuel rail.
Start the engine and monitor the pressure; it should match the specifications in the service manual.
If pressure is low, check the fuel filter and fuel pump for issues.

6. Inspect for Vacuum Leaks

Use a smoke machine to introduce smoke into the intake system.
Observe for smoke escaping from any hoses or gaskets; repair or replace as needed.
Alternatively, use soapy water on suspected areas and look for bubbles indicating leaks.