why does my Ford Explorer Fifth Generation (2011-2019) check engine light keep turning on

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

Error Code: P0420

3 min read

522 words

Problem Statement

Learn how to diagnose and fix P0420 catalytic converter efficiency issues in Ford Explorer (2011-2019). Step-by-step guide with diagnostic procedures and repair instructions.

Error Code

P0420

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 inspecting any components to prevent burns.

Symptoms

•Check engine light illuminated
•Vehicle may exhibit rough idling
•Possible decrease in fuel efficiency
•Engine misfires or hesitations during acceleration
•Smell of fuel or exhaust fumes
•Increased emissions from the exhaust

Diagnostic Steps

1
Scan the vehicle’s onboard computer for error codes using an OBD-II scanner.
2
Review the error codes to identify specific issues (e.g., P0420 for catalytic converter efficiency).
3
Inspect the vehicle's fuel cap for proper sealing and condition.
4
Check for vacuum leaks by inspecting hoses and connections around the intake manifold.
5
Test the ignition system components, including spark plugs and coils, for proper function.
6
Examine the exhaust system for blockages or damage.
7
Evaluate the operation of the mass airflow sensor (MAF) and throttle position sensor (TPS).

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
•Multimeter
•Vacuum gauge

Parts Required

•Spark plugs
•Ignition coils (if needed)
•Catalytic converter (if needed)
•Vacuum hoses (if damaged)

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Diagnostic Steps

1
Scan the vehicle’s onboard computer for error codes using an OBD-II scanner.
2
Review the error codes to identify specific issues (e.g., P0420 for catalytic converter efficiency).
3
Inspect the vehicle's fuel cap for proper sealing and condition.
4
Check for vacuum leaks by inspecting hoses and connections around the intake manifold.
5
Test the ignition system components, including spark plugs and coils, for proper function.
6
Examine the exhaust system for blockages or damage.
7
Evaluate the operation of the mass airflow sensor (MAF) and throttle position sensor (TPS).

Solution

1. Preparation

Gather tools and parts needed for repair.
Disconnect the battery to prevent electrical shorts while working on the vehicle.
Tools Required: OBD-II scanner, socket set, multimeter, vacuum gauge.

2. Address Error Codes

Based on the retrieved error codes, perform necessary repairs:
- For P0420 (Catalytic Converter):
  1. Inspect the catalytic converter for physical damage.
  2. If damaged, replace it with a new catalytic converter.
  3. Torque the exhaust bolts to manufacturer specifications (usually around 30-35 ft-lbs).
- For Ignition Misfires:
  1. Remove spark plugs and inspect for wear or fouling.
  2. Replace faulty spark plugs with OEM parts.
  3. Inspect and replace ignition coils if necessary.
- For Vacuum Leaks:
  1. Use a vacuum gauge to check for leaks.
  2. Replace any damaged hoses or gaskets.

3. Sensor Inspection

Check the MAF and TPS:
1. Disconnect the electrical connectors.
2. Clean the MAF using MAF cleaner spray.
3. Test the TPS with a multimeter to ensure it reads correctly across its range of motion.
4. Replace the sensor if it is not functioning properly.

4. Reassemble and Reconnect

After repairs, reassemble any removed components.
Reconnect the battery and ensure all connections are secure.