how to fix P0302 code on Honda Accord 8th Generation (2008-2012)

Solution

1. Preparation

• Gather tools and parts. Ensure the engine is cool.
• Disconnect the negative battery terminal.
• Tools Required: Socket set, torque wrench, multimeter, compression tester, fuel pressure gauge.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 2:
  • Unplug the electrical connector.
  • Use a socket to remove the mounting bolts.
• Remove the spark plug:
  • Use a spark plug socket and ratchet to unscrew the spark plug.
• Inspect the spark plug:
  • Check for fouling, wear, or damage. Replace if necessary.
• Install new spark plug:
  • Apply anti-seize compound to the threads (if applicable).
  • Torque to the manufacturer’s specification (typically around 13-16 ft-lbs).

3. Inspect and Replace Ignition Coil

• If the spark plug is fine, inspect the ignition coil for faults:
  • Use a multimeter to check resistance (consult service manual for specific resistance values).
• Replace the ignition coil if testing indicates a failure:
  • Install the new ignition coil and reconnect the electrical connector.
  • Torque to specification.

4. Check Fuel Injector

• Test the fuel injector on cylinder 2:
  • Disconnect the connector and use a multimeter to check for proper voltage.
• If faulty, replace the fuel injector:
  • Remove the fuel rail (ensure to relieve fuel pressure first).
  • Replace the injector and reassemble the fuel rail.
  • Torque the rail bolts to specification.

5. Compression Test

• Perform a compression test on cylinder 2:
  • Remove spark plug, install compression tester, crank engine.
  • Compare results to manufacturer specifications. Replace engine components if compression is low.

6. Reassemble and Test

• Reconnect the battery terminal.
• Start the engine and observe for any misfire symptoms.
• Clear the P0302 code with the OBD-II scanner and take the vehicle for a test drive.