my Honda Civic 10th Generation (2016-2021) engine light is on and I have P0302 code, how to fix it

Solution

1. Preparation

• Gather tools and parts: OBD-II scanner, socket set, torque wrench, multimeter, compression tester, replacement spark plug (if necessary), ignition coil (if necessary), and fuel injector (if necessary).
• Ensure safety by disconnecting the battery before beginning any repair.

2. Inspect and Replace Spark Plug

1. Remove the engine cover (if applicable) to access the spark plugs.
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 or fouling; replace it if necessary.
6. Install a new spark plug, tightening it to the manufacturer’s specified torque (usually around 13-15 lb-ft).
7. Reinstall the ignition coil and reconnect the electrical connector.

3. Check and Replace Ignition Coil

1. If the spark plug is in good condition, test the ignition coil for cylinder 2.
2. If swapping the coil showed a misfire in a different cylinder, replace the ignition coil for cylinder 2.
3. Install the new ignition coil and reconnect the connector.

4. Inspect and Replace Fuel Injector

1. If the misfire persists, inspect the fuel injector for cylinder 2.
2. Disconnect the fuel injector connector.
3. Remove the fuel injector using the appropriate tools.
4. Test the injector for resistance with a multimeter; replace if faulty.
5. Install the new injector and reconnect the connector.

5. Final Assembly

• Reassemble any components removed during the inspection.
• Reconnect the battery.