how can I fix the P0302 code in my Ford F-150 12th Generation (2009-2014)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter, fuel injector tester, vacuum gauge.
• Disconnect the negative battery terminal to ensure safety during repairs.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 2 by unscrewing the retaining bolts and disconnecting the electrical connector.
• Remove the spark plug using a spark plug socket. Inspect for signs of wear or fouling.
• If necessary, replace the spark plug with a new one, ensuring it is gapped according to manufacturer specifications (usually around 0.054 inches for Ford F-150).
• Reinstall the ignition coil and reconnect the electrical connector, tightening to the specified torque (typically around 10-12 ft-lbs).

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, test the ignition coil using a multimeter to check for proper resistance.
• If faulty, replace the ignition coil with a quality OEM or equivalent part.
• Reinstall the ignition coil and ensure all connections are secure.

4. Check Fuel Injector

• Using a fuel injector tester, check for proper operation of the fuel injector on cylinder 2.
• If the injector is not functioning, replace it with a new one. Ensure to clean the injector ports before installation.
• Reconnect all components securely.

5. Assess Compression

• Perform a compression test on cylinder 2 to determine if there are any mechanical issues.
• If compression is low, further investigation may be needed, which could involve head gasket replacement or valve adjustments.

6. Final Checks and Reassembly

• Reconnect the negative battery terminal.
• Clear the error codes using the OBD-II scanner.
• Start the engine and observe for any misfires or warning lights.