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

Solution

1. Preparation

• Gather tools and parts required.
• Ensure the engine is cool to prevent burns.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket, anti-seize compound.
• Remove the ignition coil on cylinder 2 by unbolting it and disconnecting the electrical connector.
• Use a spark plug socket to remove the spark plug from cylinder 2. Check condition; if worn, replace.
• Apply a small amount of anti-seize compound to the threads of the new spark plug.
• Install the new spark plug and torque it to the manufacturer’s specifications (typically around 13-15 lb-ft).
• Reinstall the ignition coil.

3. Inspect and Replace Ignition Coil (if necessary)

• Tools Required: Socket set, multimeter.
• If the ignition coil appeared faulty during inspection, remove it and test with a multimeter for proper resistance.
• If out of specification, replace the ignition coil with a new one.
• Reinstall the coil, ensuring it is securely connected.

4. Clean or Replace Fuel Injector (if necessary)

• Tools Required: Fuel injector cleaning kit or replacement injector, safety glasses.
• Remove the fuel rail if necessary to access the injector; disconnect fuel lines carefully.
• Use a fuel injector cleaning kit to clean the injector or replace it if it's clogged or malfunctioning.
• Reinstall the fuel rail and reconnect all lines securely.

5. Perform Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 2 and attach the compression tester.
• Crank the engine and record the compression reading; compare it to specifications (usually around 180-200 psi).
• If compression is low, further investigation into valves or piston rings may be necessary.