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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shock.
• Allow the engine to cool before starting any work.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 2 using a socket set.
• Remove the spark plug from cylinder 2 using a spark plug socket.
• Inspect the spark plug for wear, carbon buildup, or damage. Replace if necessary.
• Install the new spark plug, ensuring a torque of 13 lb-ft (17 Nm).
• Reinstall the ignition coil, ensuring it clicks into place.

3. Inspect and Replace Fuel Injector

• Disconnect the electrical connector from the cylinder 2 fuel injector.
• Remove the fuel rail assembly if necessary to access the injector.
• Remove the fuel injector from its seat.
• Install the new fuel injector with a new O-ring (if applicable).
• Reassemble the fuel rail and reconnect the electrical connector.

4. Check and Clean or Replace Ignition Coil

• Remove the ignition coil from cylinder 2.
• Inspect for any cracks or damage to the coil.
• If damaged, replace with a new ignition coil.
• If the coil is functional, clean the connection points before reinstalling.

5. Perform Compression Test (if needed)

• Remove the spark plugs from all cylinders.
• Install the compression gauge into cylinder 2.
• Crank the engine for several seconds and note the reading. Compare with manufacturer's specifications.
• If compression is low, further investigation into the engine's internal components is necessary.