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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to ensure safety while working on electrical components.

2. Replace Spark Plug and Ignition Coil

1. Remove Engine Cover (if applicable)
   • Use a socket set to remove any bolts securing the engine cover.
2. Access Cylinder 3 Components
   • Locate cylinder 3 (usually the second cylinder from the timing belt side) and remove any components obstructing access.
3. Remove Spark Plug
   • Use a spark plug socket to carefully unscrew and remove the spark plug from cylinder 3.
   • Inspect the spark plug for signs of fouling or damage.
4. Replace Ignition Coil
   • Disconnect the electrical connector from the ignition coil.
   • Remove the bolt securing the ignition coil and lift it out.
   • Install the new ignition coil and secure it with the bolt. Reconnect the electrical connector.
5. Install New Spark Plug
   • Gap the new spark plug to the manufacturer's specifications (usually around 0.044 inches for Honda).
   • Thread the new spark plug into cylinder 3 and torque it to 13 lb-ft using a torque wrench.

3. Inspect and Replace Fuel Injector (if necessary)

1. Disconnect Injector Connector
   • Carefully disconnect the fuel injector electrical connector for cylinder 3.
2. Remove Fuel Injector
   • Remove any retaining clips if applicable, and pull the fuel injector out of the fuel rail.
3. Install New Fuel Injector
   • Lubricate the O-ring of the new fuel injector with clean engine oil.
   • Insert the new fuel injector into the fuel rail and secure it properly.
4. Reconnect Electrical Connector
   • Reconnect the electrical connector to the new fuel injector.

4. Final Steps

1. Reassemble Components
   • Reinstall any components removed for access and the engine cover.
2. Reconnect Battery
   • Reconnect the vehicle battery.
3. Clear Error Codes
   • Use the OBD-II scanner to clear the P0303 code from the ECU.