how to fix P0302 misfire code on Ford F-150 13th Generation (2015-2020)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative terminal of the battery to prevent electrical shock.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil connected to cylinder 2 by unbolting it and disconnecting the electrical connector.
• Remove the spark plug using a spark plug socket.
• Inspect the old spark plug for signs of fouling or wear.
• Install the new spark plug, ensuring it is torqued to the manufacturer’s specifications (typically around 13 lb-ft).
• Reattach the ignition coil and ensure the connector is secure.

3. Test and Replace Ignition Coil (if necessary)

• Tools Required: Multimeter.
• Use a multimeter to measure the resistance of the ignition coil. Compare with manufacturer specifications (usually around 0.5 to 1.5 ohms for primary resistance).
• If the coil is faulty, remove it and replace it with a new one, ensuring it is properly seated and the connector is reattached.

4. Inspect and Replace Fuel Injector (if necessary)

• Tools Required: Fuel injector puller, ratchet set.
• Disconnect the fuel injector connector and remove any retaining clips.
• Carefully remove the fuel injector from cylinder 2.
• Check the injector for clogs or damage. If necessary, replace with a new injector following the manufacturer's specifications.
• Reinstall the injector and reconnect the electrical connector.

5. Conduct a Compression Test

• Tools Required: Compression gauge.
• Remove the spark plug from cylinder 2 and install the compression gauge.
• Crank the engine and note the reading; compare with specifications (usually between 120-180 psi).
• If compression is low, further diagnose for potential mechanical issues (head gasket, worn rings).