how to fix P0303 code on Honda Accord 8th Generation (2008-2012)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the engine is cool before beginning work.
• Disconnect the battery to prevent electrical shorts.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the engine cover (if applicable).
• Disconnect the ignition coil connector for cylinder 3.
• Remove the ignition coil from cylinder 3.
• Use a spark plug socket to remove the spark plug from cylinder 3.
• Inspect and replace with a new spark plug, ensuring it is gapped correctly (typically 0.044 inches for Honda).
• Reinstall the ignition coil and reconnect the connector.

3. Replace Ignition Coil (if necessary)

• Tools Required: Socket set, torque wrench
• If the ignition coil was determined to be faulty, remove the ignition coil from cylinder 3.
• Install the new ignition coil and reconnect the electrical connector.
• Ensure all connections are secure.

4. Replace Fuel Injector (if necessary)

• Tools Required: Fuel line disconnect tool, socket set, torque wrench
• Relieve fuel pressure from the fuel system by removing the fuel pump relay and running the engine until it stalls.
• Disconnect the fuel line and electrical connector from the fuel injector for cylinder 3.
• Remove the old fuel injector and install the new one, ensuring it is seated properly.
• Reconnect the fuel line and electrical connector, and reinstall the fuel pump relay.

5. Final Assembly

• Reinstall any components removed during the repair.
• Reconnect the battery.
• Start the engine and allow it to reach operating temperature.