how to fix the P0303 code in my Honda Accord 10th Generation (2018-2022) misfire on cylinder 3

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool if it has been running.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the ignition coil from cylinder 3 by unscrewing the mounting bolts and disconnecting the electrical connector.
• Remove the spark plug using the spark plug socket.
• Inspect the spark plug for signs of wear or carbon buildup. Replace with a new spark plug if necessary.
• Apply a small amount of dielectric grease to the spark plug threads.
• Install the new spark plug and torque it to manufacturer specifications (typically around 13-16 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Replace Ignition Coil (if necessary)

• Tools Required: Socket set, torque wrench.
• Remove the ignition coil from cylinder 3 as described above.
• Install a new ignition coil and torque it to manufacturer specifications.
• Reconnect the electrical connector.

4. Clean or Replace Fuel Injector (if necessary)

• Tools Required: Fuel injector cleaning kit or replacement injector.
• Disconnect the fuel line and electrical connector from the fuel injector on cylinder 3.
• Remove the injector using the appropriate tools.
• Clean the injector with a cleaning kit or replace it with a new one.
• Reinstall the injector and reconnect the fuel line and electrical connector.

5. Reassemble and Check for Leaks

• Reconnect the negative battery terminal.
• Start the engine and check for any leaks around the fuel injector and ignition coil.