how to fix Honda Accord Eleventh Generation (2023-present) P0303 engine misfire

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool before working on it.

2. Replace Spark Plug

• Remove the ignition coil for cylinder 3 by unscrewing the mounting bolt and disconnecting the electrical connector.
• Remove the spark plug using a spark plug socket and ratchet.
• Inspect the spark plug for wear and replace it with a new one if necessary (ensure proper gap according to manufacturer specs).
• Reinstall the ignition coil by reversing the removal process, ensuring the connector is securely attached.

3. Test or Replace Ignition Coil

• Test the ignition coil for cylinder 3 with an ohmmeter; compare the readings with the manufacturer’s specifications.
• If the coil is faulty, replace it with a new one, ensuring that it is seated properly and that the connector is secure.

4. Inspect and Replace Fuel Injector (if necessary)

• If the fuel injector is suspected to be the issue, remove it from the cylinder head by disconnecting the fuel rail and unscrewing the injector.
• Clean the injector or replace it with a new unit if it is clogged or malfunctioning.
• Reinstall the fuel injector and reconnect the fuel rail.

5. Reassemble and Connect Battery

• Recheck all connections and components.
• Reconnect the battery and ensure all tools are removed from the engine bay.