how to fix P0302 misfire code on Honda Accord 8th Generation (2008-2012)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal for safety.

2. Replace Spark Plug

• Tools Required: Socket set, spark plug socket, torque wrench.
• Remove the ignition coil from cylinder 2.
• Use a spark plug socket to remove the spark plug from cylinder 2.
• Inspect the old spark plug; if it’s worn or fouled, replace it with a new one.
• Torque the new spark plug to the manufacturer's specifications (typically around 13-16 lb-ft).
• Reinstall the ignition coil.

3. Inspect and Replace Ignition Coil (if necessary)

• Tools Required: Socket set, torque wrench.
• If the ignition coil is suspected to be faulty, remove the coil from cylinder 2.
• Test the coil by swapping it with a known good coil from another cylinder.
• If the misfire follows the coil, replace it with a new one.
• Reinstall the ignition coil and ensure it is secured properly.

4. Clean or Replace Fuel Injector (if necessary)

• Tools Required: Fuel injector cleaning kit or new fuel injector, socket set.
• Disconnect the fuel injector connector from cylinder 2.
• Remove the fuel rail if necessary to access the injector.
• If cleaning, follow the instructions for the injector cleaning kit; if replacing, install the new injector.
• Reassemble all parts and ensure all connections are secure.

5. Check for Vacuum Leaks

• Tools Required: Vacuum gauge or smoke machine.
• Inspect all vacuum lines connected to the intake manifold for cracks or disconnections.
• Use a vacuum gauge to check if the readings are within specifications.
• Repair or replace any damaged vacuum lines.