how to fix the check engine light code P0302 on Honda Civic 10th Generation (2016-2021)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative terminal of the battery to prevent electrical shorts.
• Ensure the environment is safe and well-ventilated.

2. Inspect and Replace Spark Plug

1. Remove the engine cover if applicable using a socket set.
2. Disconnect the ignition coil connector for cylinder 2.
3. Remove the ignition coil using a socket set.
4. Remove the spark plug using a spark plug socket.
5. Inspect the spark plug for wear, carbon buildup, or damage. Replace if necessary with a new spark plug (OEM recommended gap).
6. Reinstall the spark plug, torque to specification (typically around 13 lb-ft).
7. Reattach the ignition coil and connector.

3. Check and Replace Ignition Coil (if needed)

1. If the spark plug is in good condition, test the ignition coil with a multimeter to verify its resistance.
2. If out of specification, replace the ignition coil for cylinder 2 with a new one.
3. Reconnect the ignition coil and any connectors.

4. Test Fuel Injector

1. Use a fuel injector tester to check the operation of the injector for cylinder 2.
2. If the injector is faulty, replace it with a new one.
3. Reattach any connectors and ensure proper seating.

5. Perform Compression Test

1. Remove the spark plug for cylinder 2 and insert the compression tester.
2. Crank the engine and record the compression reading.
3. If compression is low, further investigation into the engine internals may be required.