how to fix P0302 code in my Toyota Corolla E140 (2006-2013)?

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative terminal of the battery to ensure safety during repair.

2. Inspect and Replace Spark Plug

• Sub-steps:
  • Remove the ignition coil for cylinder 2 by unscrewing the retaining bolt and disconnecting the electrical connector.
  • Remove the spark plug using a spark plug socket and ratchet.
  • Inspect the spark plug for wear, fouling, or damage; replace if necessary.
  • Install a new spark plug to the manufacturer's specifications (typically 13 ft-lbs torque).
  • Reinstall the ignition coil and reconnect the electrical connector.

3. Test and Replace Ignition Coil (if necessary)

• Sub-steps:
  • If the spark plug is in good condition but the misfire persists, test the ignition coil for cylinder 2 using a multimeter (check for primary and secondary resistance).
  • If the coil is faulty, remove it and install a new coil.
  • Ensure the ignition coil is seated properly and reconnect the electrical connector.

4. Inspect and Clean or Replace Fuel Injector

• Sub-steps:
  • If misfire persists, use a fuel injector tester to check the injector's operation.
  • If not functioning, remove the fuel injector using appropriate tools (fuel line disconnect tool may be needed).
  • Clean the injector with a suitable cleaning solution or replace it with a new one.
  • Reinstall the injector, ensuring proper sealing and connections.

5. Reassemble and Test

• Sub-steps:
  • Reconnect any removed components.
  • Reconnect the negative battery terminal.
  • Start the engine and check for smooth operation and any remaining codes.