my Honda Civic 10th Generation (2016-2021) has a check engine light and code P0302

Solution

1. Preparation

• Gather tools and parts needed.
• Park the vehicle on a flat surface and engage the parking brake.
• Disconnect the negative battery terminal to avoid electrical shorts.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Compression tester
• Multimeter
• Basic hand tools

2. Inspect and Replace Spark Plug

1. Remove the engine cover if applicable.
2. Disconnect the ignition coil connector and unbolt the ignition coil.
3. Carefully remove the spark plug using a spark plug socket.
4. Inspect the spark plug for wear or damage; replace if necessary.
5. Install a new spark plug, torque to manufacturer specifications (typically around 13 lb-ft).
6. Reinstall the ignition coil and reconnect the connector.

3. Test and Replace Ignition Coil (if needed)

1. Use a multimeter to test the primary and secondary resistance of the ignition coil against manufacturer specifications.
2. If the ignition coil is faulty, remove it and install a new one.
3. Ensure proper seating and connections, and torque to manufacturer specifications.

4. Inspect and Clean Fuel Injector

1. Disconnect the fuel injector connector.
2. Remove the fuel injector from the rail (may require fuel rail removal).
3. Inspect for clogs or damage; clean or replace as needed.
4. Reinstall the fuel injector, ensuring a proper seal.

5. Compression Test (if misfire persists)

1. Remove the spark plug from cylinder 2.
2. Insert the compression tester into the spark plug hole.
3. Crank the engine to obtain a compression reading. Compare to manufacturer specifications (usually 180-200 psi).
4. If compression is low, further diagnosis may be necessary (valve issues, head gasket, etc.).