how to fix P0302 misfire code in my Honda Civic 11th Generation (2022-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to avoid any electrical issues.

2. Inspect and Replace Spark Plug

1. Remove the engine cover if necessary.
2. Remove the ignition coil for cylinder 2:
   • Disconnect the electrical connector.
   • Unbolt the coil using a socket set.
3. Remove the spark plug using a spark plug socket:
   • Turn counterclockwise to loosen and remove.
4. Inspect the spark plug for wear or damage. If worn, replace with a new spark plug (use OEM specifications).
5. Check the spark plug gap and adjust if necessary.
6. Reinstall the spark plug and ignition coil, ensuring they are securely fastened.

3. Test and Replace Ignition Coil (if needed)

1. If the spark plug is in good condition, test the ignition coil using a multimeter:
   • Set the multimeter to the resistance setting.
   • Measure the resistance between the positive and negative terminals of the coil.
   • Compare with specifications; replace if out of range.
2. If replacement is necessary, install a new ignition coil by reversing the removal process.

4. Inspect and Test Fuel Injector

1. Disconnect the fuel injector connector for cylinder 2.
2. Check the injector resistance with a multimeter:
   • Measure across the terminals; compare to specifications.
3. If the injector is faulty, replace it:
   • Remove the fuel rail if necessary to access the injector.
   • Install the new injector and reconnect the wiring.

5. Reconnect Battery and Clear Codes

1. Reconnect the battery terminal.
2. Use the OBD-II scanner to clear the P0302 code.
3. Run the engine to ensure the code does not return.