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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plug and Ignition Coil

1. Remove Engine Cover (if applicable)
   • Use a socket set to unscrew and remove the engine cover.
2. Access Cylinder 3 Components
   • Identify the location of cylinder 3 spark plug and ignition coil.
3. Remove Ignition Coil
   • Unplug the ignition coil connector.
   • Remove the screws securing the ignition coil using a socket wrench.
   • Carefully pull out the ignition coil.
4. Replace Spark Plug
   • Using a spark plug socket, carefully unscrew the old spark plug from cylinder 3.
   • Inspect the old spark plug for signs of wear or damage.
   • Apply anti-seize compound to the threads of the new spark plug and install it to the specified torque (typically 13-16 ft-lbs).
5. Install New Ignition Coil
   • Insert the new ignition coil into place and secure it with screws.
   • Reconnect the ignition coil connector.

3. Check Fuel Injector

1. Remove Fuel Injector Connector
   • Unplug the connector from the fuel injector located on cylinder 3.
2. Test Injector Operation
   • Use a multimeter to check the resistance of the injector (should be within manufacturer specs).
   • If faulty, replace the fuel injector.

4. Reassemble and Reconnect

• Reinstall the engine cover (if removed).
• Reconnect the negative battery terminal.