how to diagnose and fix P0301 misfire code on Ford Explorer Fifth Generation (2011-2019)

Solution

1. Preparation

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

2. Inspect Ignition Components

• Tools Required: Socket set, torque wrench, pliers
• Remove the engine cover if applicable.
• Disconnect the electrical connector from the ignition coil on cylinder 1.
• Remove the ignition coil by unscrewing the retaining bolts and gently pulling it out.
• Inspect the spark plug for wear or carbon deposits. If necessary, remove it using a spark plug socket.
• Replace the spark plug if it is worn or fouled (set gap according to specifications).

3. Test and Replace Ignition Coil

• Inspect the ignition coil for cracks or damage.
• Test the ignition coil with a multimeter to ensure it has the correct resistance (consult service manual for specifications).
• If faulty, replace the ignition coil with a new one.

4. Inspect Fuel Injector

• Locate the fuel injector for cylinder 1.
• Disconnect the electrical connector and fuel line (use caution; have a rag ready to catch any fuel).
• Test the injector for proper operation using a noid light or multimeter.
• If the injector is not functioning, replace it with a new injector.

5. Check for Vacuum Leaks

• Inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
• Use a smoke machine or carb cleaner to check for leaks around the intake manifold.
• Repair or replace any damaged hoses or gaskets.

6. Reassemble and Test

• Reinstall all components in reverse order and torque to specifications.
• Reconnect the negative battery terminal.
• Start the engine and allow it to reach operating temperature.