how to 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 off.
• Disconnect the battery to prevent electrical shock.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil from cylinder 1 by unscrewing the mounting bolts.
• Disconnect the electrical connector from the ignition coil.
• Remove the old spark plug using a spark plug socket.
• Inspect the old spark plug for wear; replace with a new spark plug if necessary (gap according to manufacturer specifications).
• Reinstall the spark plug and torque to specification (usually around 13-15 lb-ft).
• Reattach the ignition coil and secure it with bolts.

3. Inspect and Replace Ignition Coil

• If the spark plug appears normal, test the ignition coil for proper function. If faulty, replace the ignition coil.
• Tools Required: Multimeter (if testing) or socket set.
• Remove the ignition coil as described above.
• Install the new ignition coil, ensuring it is seated properly.
• Reconnect the electrical connector.

4. Fuel Injector Testing

• If the ignition components are good, check the fuel injector for cylinder 1.
• Tools Required: Noid light or multimeter.
• Remove the fuel injector connector.
• Connect a noid light to verify injector pulse while cranking the engine. If no signal, replace the injector or check wiring.
• Reconnect the injector after testing.

5. Compression Test

• If the misfire persists, conduct a compression test.
• Tools Required: Compression tester.
• Remove spark plugs from all cylinders for accurate testing.
• Insert the compression tester into cylinder 1 and crank the engine.
• Check the compression reading; it should be within the manufacturer’s specified range. If low, further internal engine diagnostics may be required.