how to troubleshoot P0302 code in Ford F-150 14th Generation (2021-2024)

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 and Replace Spark Plug

• Sub-steps:
  1. Remove the ignition coil from cylinder 2 by unscrewing the mounting bolts and disconnecting the electrical connector.
  2. Remove the spark plug using a spark plug socket and ratchet.
  3. Inspect the spark plug for signs of wear or damage (e.g., carbon buildup, cracked insulator).
  4. If the spark plug is faulty, replace it with a new one, ensuring the correct gap is set (typically around 0.030 inches for Ford F-150).
  5. Reinstall the ignition coil and reconnect the electrical connector.

3. Test and Replace Ignition Coil (if necessary)

• Sub-steps:
  1. Test the ignition coil using a multimeter to check for proper resistance according to the manufacturer’s specifications.
  2. If the ignition coil is faulty, remove the old coil and install a new one.
  3. Reconnect all wiring and ensure secure connections.

4. Inspect and Replace Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 2.
  2. Use a noid light to check for the presence of voltage when the ignition is on (cranking the engine may be required).
  3. If no voltage is present, trace wiring back to the ECM for issues.
  4. If the injector is faulty, remove it from the fuel rail and replace it with a new one.
  5. Reconnect the injector and ensure all connections are secure.

5. Perform Compression Test

• Sub-steps:
  1. Remove the spark plug from cylinder 2 again for access.
  2. Insert a compression gauge into the spark plug hole.
  3. Crank the engine for a few seconds and record the compression reading.
  4. Compare the reading to the manufacturer's specifications (usually around 120-180 PSI).
  5. If compression is low, further inspection of the valve train or piston rings may be required.