how to fix the P0301 code in my Ford Explorer Fifth Generation (2011-2019)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, fuel injector tester, multimeter.
• Ensure the vehicle is parked on a level surface, and the engine is cool.

2. Inspect and Replace Spark Plug

• Remove the engine cover if necessary.
• Disconnect the negative battery terminal.
• Remove the ignition coil from cylinder 1:
  • Unscrew the bolts securing the coil and gently pull it out.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear, carbon buildup, or damage.
• If necessary, replace the spark plug with a new one, ensuring it is gapped correctly (typically 0.054 inches for Ford engines).
• Reinstall the ignition coil and reconnect the battery terminal.

3. Test and Replace Fuel Injector

• Connect the fuel injector tester to the injector of cylinder 1.
• Activate the tester to ensure the injector is firing properly.
• If the injector is faulty, remove the fuel rail:
  • Relieve fuel pressure by removing the fuel pump fuse and starting the engine until it stalls.
  • Disconnect fuel lines and remove the bolts securing the fuel rail.
• Replace the faulty fuel injector with a new one.
• Reinstall the fuel rail and reconnect all lines securely.

4. Perform Compression Test

• Insert the compression tester into the spark plug hole of cylinder 1.
• Crank the engine several times to obtain a compression reading.
• Compare the reading to manufacturer specifications (typically around 120-150 psi for Ford engines).
• If compression is low, further investigation may be needed, including checking for a blown head gasket or valve issues.

5. Inspect for Vacuum Leaks

• With the engine running, spray a small amount of carburetor cleaner around the intake manifold and vacuum lines.
• Listen for changes in engine RPM, which indicates a vacuum leak.
• Repair or replace any damaged vacuum lines or gaskets.