how to diagnose a P0302 code in Honda Accord Eleventh Generation (2023-present)

Solution

1. Preparation

• Gather tools and parts. Ensure the engine is cool before starting.
• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, compression tester.
• Safety Warnings: Disconnect the battery before working on electrical systems.

2. Replace Spark Plug

• Remove the ignition coil for cylinder 2:
  • Disconnect the electrical connector.
  • Unbolt the coil using a socket.
• Remove the spark plug:
  • Use a spark plug socket to unscrew the spark plug.
• Install the new spark plug:
  • Torque the new spark plug to the manufacturer’s specifications (typically around 13-15 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Test Ignition Coil

• If the coil was suspect:
  • Remove the coil and test it with a multimeter to check resistance against specifications (usually around 0.5-0.9 ohms for primary resistance).
  • Replace the coil if it is out of specifications.

4. Inspect and Test Fuel Injector

• Remove the fuel injector for cylinder 2:
  • Disconnect the electrical connector.
  • Unclip or unbolt the injector from the fuel rail.
• Use a multimeter to check the injector's resistance, comparing it to specifications (typically around 12-16 ohms).
• If faulty, replace the fuel injector and ensure proper sealing with new O-rings.

5. Perform Compression Test

• Remove the spark plug from cylinder 2 and insert the compression tester.
• Crank the engine and record the compression reading.
• Compare the reading to manufacturer's specifications (usually around 180-220 psi). If low, further investigation is needed for internal engine issues.