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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts during work.

2. Address Check Engine Codes

• Use the OBD-II scanner to retrieve trouble codes.
• Look up the codes to determine the specific issues (e.g., P0420 for catalytic converter efficiency).
• Based on the codes, prioritize repairs or component replacements.

3. Inspect and Replace Components

For Common Issues:

• Gas Cap Replacement:

  • Remove the gas cap and inspect for damage.
  • Replace with a new gas cap if cracked or not sealing correctly.

• Spark Plug Replacement:

  • Remove the ignition coils using a socket set.
  • Unscrew the old spark plugs with a spark plug socket and replace them with new ones.
  • Torque new spark plugs to manufacturer specifications (typically 13-15 lb-ft).

• Oxygen Sensor Replacement:

  • Locate the faulty oxygen sensor as per the error codes.
  • Disconnect the electrical connector and unscrew the old sensor.
  • Install the new oxygen sensor, ensuring it's properly torqued (usually 30 lb-ft).

4. Reconnect and Test

• Reconnect the battery.
• Clear the check engine codes using the OBD-II scanner.
• Test drive the vehicle to monitor if the check engine light reappears.