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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts during repair.

2. Replace Spark Plug

1. Remove the engine cover if applicable using a socket set.
2. Disconnect the ignition coil connector for cylinder 2.
3. Unbolt and remove the ignition coil from cylinder 2.
4. Use a spark plug socket to remove the old spark plug.
5. Inspect and apply anti-seize lubricant on the threads of the new spark plug.
6. Install the new spark plug and tighten to the manufacturer's specified torque (typically around 13 lb-ft).
7. Reinstall the ignition coil and reconnect the connector.

3. Replace Ignition Coil (if necessary)

1. If the ignition coil tested faulty, replace it with a new one.
2. Follow the steps in section 2 to remove and replace the ignition coil.
3. Ensure proper seating and connection of the ignition coil harness.

4. Clean or Replace Fuel Injector (if necessary)

1. Remove the fuel rail to access the injector for cylinder 2.
2. Disconnect the fuel line and ensure to relieve fuel pressure prior.
3. Remove the old injector and clean or replace it as required.
4. Reinstall the injector and fuel rail, ensuring all connections are secure.

5. Perform Compression Test (if necessary)

1. Remove the spark plug from cylinder 2.
2. Insert a compression gauge into the spark plug hole.
3. Crank the engine and record the compression reading. Repeat for other cylinders for comparison.
4. If readings are low, further diagnosis may be needed to check for engine mechanical issues.