how to fix P0302 misfire code on Honda Civic 9th Generation (2012-2015)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before proceeding.

2. Inspect and Replace Spark Plug (if necessary)

1. Remove the engine cover if equipped.
2. Locate the spark plug for cylinder 2 (consult the service manual for exact location).
3. Use a spark plug socket and ratchet to remove the spark plug.
   • Tools Required: Spark plug socket, ratchet, torque wrench.
4. Inspect the spark plug for wear, carbon buildup, or damage. Replace if necessary.
5. Install the new spark plug and torque it to manufacturer specifications (typically around 13 lb-ft).
6. Reinstall the engine cover.

3. Check and Replace Ignition Coil (if necessary)

1. Disconnect the electrical connector from the ignition coil for cylinder 2.
2. Remove the ignition coil by unscrewing the mounting bolt.
   • Tools Required: Socket set.
3. Inspect the ignition coil for damage; replace if it shows signs of wear or malfunction.
4. Install the new ignition coil and reconnect the electrical connector.

4. Inspect and Clean Fuel Injector (if necessary)

1. Remove the fuel rail according to the manufacturer's procedure.
2. Disconnect the fuel line and electrical connectors from the fuel injector for cylinder 2.
3. Remove the fuel injector from the fuel rail.
4. Clean the injector using a suitable fuel injector cleaner or replace it if defective.
   • Parts Required: New fuel injector (if needed).
5. Reassemble the fuel rail and reconnect the fuel line.

5. Perform Compression Test (if necessary)

1. Remove the spark plug from cylinder 2.
2. Insert a compression gauge into the spark plug hole.
3. Crank the engine for a few seconds and record the compression reading.
   • Tools Required: Compression gauge.
4. Compare the reading with the manufacturer specifications. If low, further investigation is required for possible valve or head gasket issues.