how to diagnose P0302 code in Honda Civic 11th Generation (2022-Present)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts during the repair.

2. Inspect and Replace Ignition Components

• Sub-steps:
  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 from cylinder 2 using a socket.
  4. Inspect the spark plug for wear; replace if necessary. To do this, remove the spark plug using a spark plug socket and inspect for damage or excessive wear.
  5. Install a new spark plug, tightening to the manufacturer's specified torque (typically around 13-15 lb-ft for Honda).
  6. Reinstall the ignition coil and reconnect the electrical connector.

3. Check and Replace Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 2.
  2. Remove the fuel rail if necessary to access the injector (follow specific instructions in the service manual).
  3. Test the injector with a fuel injector tester to confirm it is functioning properly; replace if it is faulty.
  4. Reinstall the fuel rail and reconnect the injector connector.

4. Perform Compression Test

• Sub-steps:
  1. Remove the spark plug from cylinder 2.
  2. Insert a compression gauge into the spark plug hole.
  3. Crank the engine to obtain a compression reading; compare it to manufacturer specifications (generally around 180-210 psi).
  4. Reinstall the spark plug and cover after testing.