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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.

2. Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if necessary.
  2. Remove the spark plug wire or ignition coil connector from cylinder 3.
  3. Use a spark plug socket to carefully unscrew and remove the old spark plug.
  4. Inspect the spark plug gap; set it to manufacturer specifications if necessary.
  5. Install the new spark plug and torque it to the manufacturer's specification (typically around 13-15 lb-ft).
  6. Reconnect the spark plug wire or ignition coil connector.

3. Replace Ignition Coil (if necessary)

• Sub-steps:
  1. Remove the ignition coil from cylinder 3 by unscrewing the mounting bolts.
  2. Disconnect the electrical connector from the ignition coil.
  3. Install the new ignition coil and torque the bolts to manufacturer specifications (usually around 7-8 lb-ft).
  4. Reconnect the electrical connector to the new ignition coil.

4. Inspect and Clean Fuel Injector (if necessary)

• Sub-steps:
  1. Remove the fuel rail to access the fuel injector for cylinder 3.
  2. Disconnect the electrical connector and fuel line from the injector.
  3. Remove the injector carefully from the rail.
  4. Clean the injector using a dedicated injector cleaner or replace it if faulty.
  5. Reinstall the injector into the fuel rail and reconnect all connectors.