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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the engine is cool and disconnect the battery.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the ignition coil from cylinder 2 by unscrewing the mounting bolts and disconnecting the electrical connector.
• Remove the spark plug from cylinder 2 using the spark plug socket.
• Inspect the spark plug for signs of wear (e.g., cracks, carbon buildup). Replace if necessary.
• Apply dielectric grease to the ignition coil boot and reinstall the new or cleaned spark plug to the specified torque (typically 13-15 lb-ft).

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, inspect the ignition coil for cylinder 2.
• Tools Required: Socket set.
• Remove the ignition coil and inspect for cracks or carbon tracking.
• If faulty, replace the ignition coil with a new unit and reconnect the electrical connector.

4. Check and Replace Fuel Injector

• If the issue persists, check the fuel injector for cylinder 2.
• Tools Required: Fuel injector removal tool (if necessary), fuel line disconnect tool.
• Disconnect the electrical connector and fuel line from the injector.
• Remove the fuel injector and inspect for clogs or damage.
• Replace with a new injector if necessary and reconnect the fuel line and electrical connector.

5. Perform Compression Test

• If misfire issues continue, perform a compression test on cylinder 2.
• Tools Required: Compression tester.
• Remove the spark plug and insert the compression tester into the cylinder.
• Crank the engine and record the compression reading. Compare it to manufacturer specifications (typically around 120-180 psi).
• If readings are low, further diagnosis may be required for internal engine issues.