how to fix the P0302 misfire code on my Honda Civic 10th Generation (2016-2021)

Solution

1. Preparation

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

2. Replace Spark Plug

• Remove the engine cover if applicable.
• Using a spark plug socket, remove the spark plug from cylinder 2.
• Inspect the old spark plug for signs of wear or damage.
• Install a new spark plug, ensuring it is gapped correctly (check manufacturer specifications).
• Torque the spark plug to the manufacturer's specifications (typically around 13-16 lb-ft).

3. Test/Replace Ignition Coil

• Disconnect the electrical connector from the ignition coil on cylinder 2.
• Remove the ignition coil using a socket wrench.
• If testing, swap the ignition coil with a working one from another cylinder and clear the codes to see if the misfire moves.
• If replacing, install the new ignition coil and reconnect the electrical connector.

4. Clean or Replace Fuel Injector

• If the injector is suspected to be faulty, remove the fuel rail to access the injector.
• Disconnect the fuel line and electrical connector from the injector.
• Remove the injector and inspect for clogs or damage.
• Clean the injector using a specialized cleaner or replace it with a new one.
• Reinstall the injector and reconnect the fuel line and electrical connector.

5. Reassemble and Reconnect

• Reinstall any components removed during the repair (engine cover, etc.).
• Reconnect the negative battery terminal.