how to fix P0302 code on Ford F-150 12th Generation (2009-2014)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, compression tester, basic hand tools.
• Safety Warnings: Disconnect the battery before working on electrical systems.

2. Replace Spark Plug

1. Remove the engine cover if applicable using a socket set.
2. Disconnect the ignition coil connector from cylinder 2.
3. Remove the ignition coil by unscrewing the mounting bolts.
4. Extract the spark plug using a spark plug socket and ratchet.
5. Inspect and replace the spark plug with a new one (using the manufacturer's specified part).
6. Reinstall the ignition coil and reconnect the electrical connector.
7. Repeat for any other cylinders if necessary.

3. Test and Replace Ignition Coil (if needed)

1. Using a multimeter, measure the resistance of the ignition coil for cylinder 2.
   • Compare readings to manufacturer specifications.
2. If the resistance is out of spec, replace the ignition coil with a new one.
3. Reinstall the new ignition coil and reconnect the electrical connector.

4. Inspect and Replace Fuel Injector (if needed)

1. Disconnect the fuel injector connector for cylinder 2.
2. Use a noid light to check for signal to the injector while cranking the engine.
3. If no signal is detected, trace the wiring back to the ECM for faults.
4. If the injector is malfunctioning, remove it and replace with a new one.
5. Reconnect the fuel injector connector.

5. Compression Test

1. Remove the spark plug from cylinder 2.
2. Insert the compression tester into the spark plug hole.
3. Crank the engine for a few seconds and read the compression gauge.
4. If compression is low, further engine diagnosis may be required (valve issues, head gasket, etc.).