how to diagnose P0302 code on Honda Civic 10th Generation (2016-2021)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shock or shorts.
• Allow the engine to cool down before starting work.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, gap gauge
• Remove the ignition coil covering the spark plug.
• Use a socket to remove the spark plug from cylinder 2.
• Inspect the spark plug for wear; replace it if necessary.
• Check the spark plug gap and adjust it to the manufacturer specification (typically 0.044 inches for Honda).
• Reinstall the spark plug and torque it to 13 lb-ft.

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set
• Disconnect the electrical connector from the ignition coil.
• Remove the ignition coil by unbolting it from the engine.
• Replace with a new ignition coil and reconnect the electrical connector.

4. Clean or Replace Fuel Injector

• Tools Required: Fuel injector cleaning kit or replacement injector
• Remove the fuel rail to access the injector for cylinder 2.
• Inspect the injector for clogs or damage; clean or replace if necessary.
• Reinstall the fuel rail and ensure all connections are secure.

5. Perform Compression Test

• Tools Required: Compression tester
• Remove the spark plug from cylinder 2 and install the compression tester.
• Crank the engine and record the compression reading.
• Compare the reading with manufacturer specifications (typically 180-220 psi). If low, further inspection of internal components may be required.