how to fix Honda Accord 10th Generation (2018-2022) P0302 misfire code

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, multimeter, compression tester, noid light, torque wrench.
• Sub-steps:
  • Park the vehicle on a level surface and ensure the engine is cool.
  • Disconnect the negative battery terminal to prevent electrical shock.

2. Replace Spark Plug

• Sub-steps:
  • Remove the ignition coil cover if applicable.
  • Unplug the electrical connector from the ignition coil in cylinder 2.
  • Unscrew the ignition coil using a socket set and remove it.
  • Remove the spark plug using a spark plug socket.
  • Inspect the spark plug for signs of wear, corrosion, or carbon buildup. Replace if necessary.
  • Install a new spark plug, ensuring to torque it to the manufacturer’s specifications (typically around 13 lb-ft).
  • Reinstall the ignition coil and reconnect the electrical connector.

3. Inspect and Test Ignition Coil

• Sub-steps:
  • If the spark plug is in good condition, test the ignition coil for proper resistance using a multimeter. The primary resistance should be within manufacturer specifications (usually 0.5 to 1.5 ohms).
  • If the coil is faulty, replace it with a new one.
  • Reconnect the ignition coil and ensure it is securely fastened.

4. Test Fuel Injector

• Sub-steps:
  • Disconnect the fuel injector connector for cylinder 2.
  • Use a noid light to check for signal at the injector connector while cranking the engine. If no signal is present, investigate wiring and ECM issues.
  • If the signal is present, check the injector for blockage or malfunction. Replace if necessary.
  • Reconnect the fuel injector connector.

5. Perform Compression Test

• Sub-steps:
  • Remove all spark plugs to avoid compression interference.
  • Insert the compression tester into the spark plug hole of cylinder 2.
  • Crank the engine several times and record the compression reading. Compare with manufacturer specifications (generally 150-200 psi).
  • If the compression is low, further investigate for potential mechanical issues (e.g., valve or piston damage).