what should I do if my Ford Explorer fails the emissions test?

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

548 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix emissions test failure in Ford Explorer. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Exhaust System

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 working on exhaust components.

Symptoms

•Check engine light illuminated
•Excessive exhaust smoke
•Unusual engine noises
•Decreased fuel efficiency
•Strong fuel odor near the exhaust

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific emissions-related issues.
2
Inspect the vehicle's air intake and exhaust systems for leaks or blockages.
3
Check the condition of the catalytic converter for signs of failure or clogging.
4
Examine the oxygen sensors for proper operation and any fault codes.
5
Test the fuel system for pressure and leaks, ensuring proper fuel delivery.
6
Inspect the EVAP system for leaks, including the gas cap and hoses.

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
•Oxygen sensor socket
•Torque wrench
•Smoke machine

Parts Required

•Catalytic converter (if needed)
•Oxygen sensors (if needed)
•Gas cap (if needed)
•EVAP hoses (if needed)
•Engine oil and oil filter

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific emissions-related issues.
2
Inspect the vehicle's air intake and exhaust systems for leaks or blockages.
3
Check the condition of the catalytic converter for signs of failure or clogging.
4
Examine the oxygen sensors for proper operation and any fault codes.
5
Test the fuel system for pressure and leaks, ensuring proper fuel delivery.
6
Inspect the EVAP system for leaks, including the gas cap and hoses.

Solution

1. Preparation

Gather tools and parts needed for repairs.
Disconnect the battery to ensure safety during repairs.

2. Addressing Fault Codes

Use the OBD-II scanner to retrieve and document the error codes.
Research each code to determine necessary repairs or component replacements.

3. Repairing or Replacing Components

a. Catalytic Converter

Remove the exhaust pipe connected to the catalytic converter using a socket wrench.
Inspect the catalytic converter for damage or clogging; replace if necessary.
Install a new catalytic converter and reattach the exhaust pipe, tightening to factory specifications.

b. Oxygen Sensors

Locate the oxygen sensors, usually positioned before and after the catalytic converter.
Disconnect the electrical connectors and unscrew the sensors using an O2 sensor socket.
Install new oxygen sensors and reconnect the electrical connectors.

c. EVAP System Repairs

Inspect the gas cap for a proper seal; replace if cracked or damaged.
Check the EVAP hoses for cracks or leaks and replace any faulty hoses.
Use a smoke machine to test the EVAP system for leaks.

4. Clean and Tune-Up

Change the engine oil and replace the oil filter.
Replace the air filter and fuel filter if necessary.
Use a fuel system cleaner to clean injectors and combustion chamber.

5. Final Assembly

Reconnect the battery and ensure all tools are removed from the engine bay.
Start the engine and allow it to reach operating temperature.