how to fix P0302 misfire code Honda Accord 10th Generation (2018-2022)

Solution

1. Preparation

• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent any electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the engine cover if applicable.
• Locate and remove the ignition coil for cylinder 2 by unscrewing the retaining bolts and disconnecting the electrical connector.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear and proper gap; replace if necessary.
• Install the new spark plug, torqueing it to the manufacturer’s specification (typically around 13 lb-ft).
• Apply dielectric grease to the ignition coil connector before reinstallation.

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set, torque wrench.
• If the spark plug is fine, test the ignition coil by swapping it with another cylinder (e.g., cylinder 1).
• If the misfire moves to cylinder 1, replace the ignition coil for cylinder 2.
• Install the new ignition coil, ensuring it is securely fastened and reconnected to the electrical connector.

4. Check Fuel Injector

• Tools Required: Noid light or multimeter, socket set.
• Connect a noid light to the fuel injector connector for cylinder 2 to confirm it is receiving a signal.
• If there is no signal, check the wiring and connectors for damages. Repair or replace as necessary.
• If the injector is faulty, remove and replace it with a new one, following the manufacturer’s torque specifications for installation.