how do I resolve a P0302 misfire code in my Honda Accord Eleventh Generation (2023-present)

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 2 using a socket set.
• Carefully pull out the spark plug from cylinder 2 using a spark plug socket.
• Inspect the spark plug for wear, carbon fouling, or damage.
• If necessary, replace the spark plug with a new one, ensuring it is correctly gapped to manufacturer specifications (typically around 0.043 inches for Honda).
• Reinstall the ignition coil after replacing the spark plug.

3. Check and Replace Ignition Coil

• If the misfire code persists after replacing the spark plug, remove the ignition coil from cylinder 2.
• Test the ignition coil with a multimeter, checking for proper resistance according to specifications.
• If faulty, replace the ignition coil with a new one and reinstall it.

4. Inspect and Replace Fuel Injector

• If the ignition coil and spark plug are confirmed functional, remove the fuel injector from cylinder 2.
• Inspect for clogs or leaks and test the injector with a noid light to ensure it is receiving the proper signal.
• If the injector is faulty, replace it with a new one and ensure proper seating and connections.

5. Compression Test

• If misfire persists, perform a compression test on cylinder 2.
• Remove the spark plug and insert the compression gauge into the spark plug hole.
• Crank the engine and record the compression reading. It should be within the manufacturer’s specified range.
• If compression is low, further investigation into potential internal engine issues may be needed.