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

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

Error Code: P0420

4 min read

607 words

Problem Statement

Learn how to diagnose and fix P0420 check engine light issue 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 opening any components.

Symptoms

•Check engine light illuminated
•Decreased fuel efficiency
•Engine stalling or misfiring
•Rough idling or hesitation during acceleration
•Unusual engine sounds (e.g., knocking or pinging)
•Emission test failure

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 for any vacuum leaks in the intake system.
4
Verify the condition of the spark plugs and ignition coils.
5
Examine the fuel system for proper pressure and functionality.
6
Inspect the exhaust system for blockages or damage.

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
•Fuel pressure gauge
•Smoke machine or carb cleaner

Parts Required

•Spark plugs
•Ignition coils (if needed)
•Fuel filter (if needed)
•Fuel pump (if needed)
•Vacuum hoses or gaskets (if needed)

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 for any vacuum leaks in the intake system.
4
Verify the condition of the spark plugs and ignition coils.
5
Examine the fuel system for proper pressure and functionality.
6
Inspect the exhaust system for blockages or damage.

Solution

1. Preparation

Gather tools and parts.
Disconnect the battery to ensure safety during the repair process.
Allow the engine to cool before starting work.

2. Address Error Codes

If error codes indicate specific issues (e.g., P0420 for catalytic converter efficiency), replace the identified faulty component.
- Tools Required: OBD-II scanner, socket set.
- Sub-steps:
  1. Note the error code and research the relevant repair procedure.
  2. Remove the faulty component (e.g., catalytic converter, ignition coil) using the socket set.
  3. Install the new part according to manufacturer specifications.

3. Inspect and Replace Spark Plugs

If spark plugs are worn or fouled, replace them.
- Tools Required: Spark plug socket, torque wrench.
- Sub-steps:
  1. Remove the ignition coils to access the spark plugs.
  2. Use the spark plug socket to unscrew and remove old spark plugs.
  3. Install new spark plugs and torque to manufacturer specifications (usually around 13-15 lb-ft).

4. Check Fuel System

If fuel pressure is low, replace the fuel filter or fuel pump as necessary.
- Tools Required: Fuel pressure gauge, socket set.
- Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Start the engine and monitor the pressure reading; it should be within the manufacturer's range (typically 30-50 psi).
  3. Replace the fuel filter if pressure is inadequate. If it remains low, replace the fuel pump.

5. Inspect and Fix Vacuum Leaks

Repair any identified vacuum leaks.
- Tools Required: Smoke machine or carb cleaner.
- Sub-steps:
  1. Use a smoke machine to introduce smoke into the intake system; observe for leaks.
  2. Alternatively, spray carb cleaner around the intake manifold and listen for engine RPM changes.
  3. Replace any damaged hoses or gaskets found during the inspection.